To clear things up, I’ve put together a basic Twitter guide that explains how to use it, Twitter lingo, privacy options, mobile applications that can be used with the service and problems that it has. Let’s get started.

Twitter limits social-networking updates to 140 characters or less. The service is surprisingly useful, but leaves room for improvement.

What is it? In short, Twitter is a free social-networking tool that keeps people connected with one another and with sources of information. Twitter users submit updates about whatever they’re currently doing, and these updates cannot exceed 140 text-based characters.

Lingo: Twitter is the name of the service. The term twittering describes the activity of updating a Twitter account. A tweet is an individual Twitter update. Twitterers are people who use the service.

Followers, not Friends: Social-networking sites like Facebook and MySpace use the term “friend” to refer to people who are connected with one another, but Twitterers can simply follow one another’s messages by finding a person’s username and selecting a “Follow” option. This alerts the person that you’re following them, and they can reciprocally choose to follow you, or not.

Why use it? While some people primarily use Twitter to post updates about their activities or comments on the news, I use the service more as a follower, allowing me to see quick snippets of news as it occurs. Most tweets are written by real people, while others, such as updates from news organizations that you’ve selected, are automatically generated. Many tweets include the addresses of Web sites with relevant articles that tell readers more on a topic.

Where is it? Twitter works on your Web browser at Twitter.com, where user updates appear in a simple list form as they are submitted. After you’ve signed up and started following other people, those people’s updates, or tweets, will appear when you log onto Twitter.com using a username and password.

Twitter also works on mobile phones, where the 140-character limit allows messages to be sent and received via SMS text messaging. Tweets can also be sent and received via email. Users with smartphones like BlackBerrys or iPhones can use one of the many popular mobile applications for accessing Twitter, which offer much richer options than simple SMS does; I’ll get into these later.

Privacy: Unlike other social-networking sites such as Facebook, Twitter isn’t focused on holding and sharing personal information about its members. Indeed, the service operates with a majority (80%, according to the company) of users opting to keep their updates public, that is, follow-able by anyone, without permission. This openness encourages people to follow one another or to see who others are already following, and then follow the same people.

However, users can opt to protect their updates, meaning they must grant permission for others to follow them. If you’d like to sign up for Twitter, but aren’t comfortable putting your first and/or last name on the site, you don’t have to; instead, just tell others your username.

Twitter Page Personalization: Each user has a Twitter page showing all of his or her updates, or tweets. (Mine is twitter.com/kabster728, and you can follow me.) This page also shows the number of people a user follows, how many people follow her and how many total updates she has posted.

Twitterers can customize their Twitter page by uploading a photo to be used as the background. The icon representing each user can also be personalized, and this is important because it appears beside that person’s tweets on Twitter.com, where followers recognize and appreciate its familiarity. Some people, including me, use pictures of themselves as their icons, while others use random shots.

Apps/Clients: Twitter works on any browser, and will also work on a mobile browser. If you have a mobile device like the BlackBerry or iPhone, you can jazz up the experience by downloading a third-party app like TwitterFon, TwitterBerry, Tweetie or Twitteriffic. Twittervision, another mobile app, plots points on maps to show where tweets originated. Desktop clients also abound, including Twhirl and TweetDeck. Twitterfeed will set your blog to automatically post content to Twitter.

@Replies, Direct Messages: Each tweet that appears in your Twitter feed can be replied to using a shortcut arrow that appears beside the tweet, and these responses to tweets are called @Replies. So if JoeSchmo tweets to say he saw the new James Bond movie and hated it, you can reply to this with a tweet of your own that says, “@JoeSchmo I still adore Daniel Craig.” These @Replies appear for everyone to see, and must start with @ plus the username of whomever you’re responding to.

Direct Messages differ from @Replies because they can be sent only between people who are following one another. These messages aren’t posted publicly. They appear on your Twitter.com page in a right-side section labeled Direct Messages and will also be sent to your mobile device if you have one registered with Twitter.

Favorites: If you read a tweet that you really like, you can save it as a favorite by selecting a small star beside the tweet, thus adding it to a Favorites section on your homepage. Anyone can see anyone else’s Favorites, regardless of whether or not they’re following one another.

Problems: Twitter’s bare-bones approach gets to the point quickly, displaying tweets in a simple, quick-read format. But the site is lacking in many areas. It used to enable searching for people on Twitter, but that capability is currently down. Now, to search for friends on Twitter, you must upload your email contacts from a Web-based mail service. The company says it plans to have people-search working again by the end of the year. Meanwhile, search.twitter.com enables keyword or location searches.

Twitter lacks the ability to sort tweets according to what the user wants. If I just want to see tweets from real people and not those that are automatically generated, I’m out of luck. Same goes if I want to keep certain friends’ tweets in a prominent place on my homepage; Twitter has no way of doing this.

Twitter users aren’t notified when someone responds to their tweet with an @Reply. I recently happened to look at @Replies on my Twitter homepage and found three from people who follow me (I don’t follow them).

If you’re adding a Web address to a tweet and the characters in the URL take up too much space, Twitter will automatically use TinyURL behind the scenes to shrink your long link into a shorter one when you post your tweet. But this works only if you have enough remaining characters in your tweet to fit the long version of your link. A built-in TinyURL converter on the page would help immensely.

Twitter says it’s working to make @Replies more effective. It also says it plans to do more with filtering and sorting, so that the Twitter interface is more useful. In the meantime, Twitter does a good job of giving people simplified news about others and the world around them. If you’re often in a rush, Twitter can be a great resource for fast information.

Edited by Walter S. Mossberg

• Email us at mossbergsolution@wsj.com. Find this and other columns and videos online free at the All Things Digital Web site: http://walt.allthingsd.com

One way to find the information you want is by setting up computer-generated alerts. These electronic notifications are relatively simple to use and offer a range of helpful services, from a virtual heads-up when your name is mentioned online to messages about a product’s price suddenly dropping.

For years, I’ve used Google Alerts as a way of keeping track of myself online. If my name is mentioned in a blog or if this column appears on the Web, such as on the site of a newspaper that syndicates it, a Google Alert sends me an email about it. Google Alerts can work for you to find a variety of things, such as telling you if a video of a favorite band popped up online or that a blogger posted something about last night’s episode of “Mad Men.”

In about a month, Google will begin delivering these alerts to users via feeds, as well as emails. Google (GOOG) certainly isn’t alone in the alerts arena, as Yahoo (YHOO), Microsoft (MSFT) and AOL (TWX) are also players. This week I tried two small companies that recently joined the mission to help users find the Web content using alerts.

Pinpointing Searches

I tried Alerts.com and Yotify.com, and found worthwhile features in both. While Google Alerts does a good job of finding search terms in news, blogs and videos, Alerts.com and Yotify use forms that are a cinch to fill out and let you pinpoint your searches.

Alerts.com offers to notify users via email, SMS text messages or even voice calls to a cellphone or landline. The site organizes your alerts on a personalized Web page and uses a desktop application called Elertz to tell you when an alert has generated results. I liked this site’s flexibility: It not only gave me different ways to receive notifications, but also enabled a variety of options for time-specific deliveries of alerts.

But Yotify has advantages of its own, including the ability to integrate with FriendFeed and Facebook so friends can offer their recommendations or opinions. It also lets users search for event tickets or items auctioned on eBay (EBAY). And a smart preview panel gives you an idea of the type of results your search will return before you submit the request for an alert.

Viewing Results

For now, Google Alerts and Yotify will send alert notifications only via email, though all three services will let you view your alert results online. All three are free, but SMS alerts sent to a cellphone via Alerts.com may not be, depending on your plan.

All in all, I found there were certain things each service was good at doing. For example, Alerts.com lets me know college football scores when I want them: only after the final score; at the end of each quarter and after the final score; or at the end of each quarter, after the final score and after each time a team scores points. Yotify gave me detailed options in a Craigslist search for furniture, including showing only listings with photos or just those that included the word “sofa” in a title; it will even hunt for a specific price range.

For the person who wants to spend minimal time creating basic alerts, Google Alerts will do the trick. These can be narrowed down to show results that fall into the News, Web, Blogs, Video or Groups categories, or you can perform more-blanketed searches using a Comprehensive category.

Alerts.com offers plenty of simple alerts that require only a bit of scheduling to set up. Each alert appears as a widget that can be expanded, edited or deleted with a simple click, and this page has a clean look with attractive, cohesive graphics.

I didn’t care much for Elertz, the desktop component of Alerts.com, because once installed, it notified me of new Alerts data using an irksome star that glowed red until I checked my notifications. Elertz didn’t work properly on my Windows XP machine until Alerts.com fixed a bug.

But Alerts.com’s price watch and price protection alerts are incredibly useful. Price watch looks to see if an item’s price drops into a lower price range, at which point users are notified. Price protection watches to see if products you bought are now on sale so you can get a refund. I tried both, and I’m hoping I’ll hear soon that a specific pair of Anthropologie boots is on sale.

Yotify uses the idea of virtual scouts that scour the Web for specific information. Scout findings can be condensed or expanded in one click, and results can be filtered for more specific findings or shared with friends via Facebook or FriendFeed.

Scout Work

But some scouts took too much work to set up. When I tried to set up a scout for college football scores, I didn’t see a sports category (Alerts.com had a colorful NCAA icon right on its home page). Instead, I had to choose News, then select ESPN, then NCAAF and finally enter “Penn State” in a key word box for my scout. And after all that, the scout offered results only daily or hourly via email.

I would also prefer if I could better organize my scout lists. As it was, all of my results appeared in one list: The NCAA scout was right above the scout that found Obama mentions on Huffington Post, and below that were results for YouTube’s most-watched videos. Yotify says it will add ways to more neatly arrange data in the next month or so.

On average, Yotify returned more results instantly, such as 10 instant Craigslist sofa results compared with Alerts.com’s two in the first few hours.

Overall, these sites are worth trying so you can find which alert system works best for you and stop wasting time searching the Web the old-fashioned way.

– Edited by Walter S. Mossberg

• Email us at mossbergsolution@wsj.com. Find this and other columns and videos online free at the All Things Digital Web site: http://walt.allthingsd.com

People rarely tag photos because identifying and labeling the people in them is an arduous, manual procedure. This week, I tested the new version of Google’s free photo organizing and editing software, Picasa 3 ( picasa.com) and an updated version of its free online-sharing component, Picasa Web Albums. The Web component tries to take some of the work out of identifying people in your shared photos using facial recognition. It automatically isolates faces in your pictures, invites you to identify them by name, and then recognizes these faces every time they pop up in future pictures so they can be tagged with one click and no typing.

New and Improved

Picasa 3, the Windows desktop application, includes a handful of new or improved features, including smarter editing tools, like cropping suggestions, and a one-step process to share photos from desktop albums. It also has the ability to create movies from still photos; to edit video clips and to upload those movies to YouTube. Personalized photo collages are a snap to make, and pictures can be labeled with text right on the image.

But my favorite feature, the ability to name-tag faces in photos, is found in Picasa Web Albums.

When photos are uploaded from a personal computer to Picasa Web Albums and a user enables Name Tags, facial recognition finds all of the photos containing faces and then groups together the photos it thinks are of the same person. The user must create name labels to go with each face. Once a face is labeled, the program does a pretty good job of recognizing that face in subsequent photos and suggesting a name to go with it. These labels can be seen by you or others, if you enable visible name tags when sharing.

In Sync

Another plus in Picasa 3 and Picasa Web Albums is that both now clearly label all albums to show which are public or private, and which are set to automatically synchronize with the Web-based versions of these albums. And these two programs are smart enough to synchronize with one another using a single mouse-click. Picasa Web Albums worked so smoothly that I often forgot it was Web-based and not a desktop application. But all photo editing and retouching must be done on Picasa 3, the desktop program. This led to many moments when I became absorbed in Picasa Web Albums and looked there for editing tools before remembering I needed to return to Picasa 3 to touch up photos.

Likewise, name tagging can only be done on Picasa Web Albums because photos must be uploaded and scanned for facial recognition to work. I found myself offline in the Picasa software, noticing a photo with a face that wasn’t name tagged and wanting to label it, but not being able to do so without using Picasa Web Albums.

Some Back and Forth

I eventually got used to this back and forth between Picasa and Picasa Web Albums, but it could be a deterrent for some users. Google (GOOG) says it is looking into how to integrate name tags with its Picasa 3 desktop software. As for making a Mac-compatible version of Picasa 3, the company says it doesn’t have any plans to report. However, the Web component, including face recognition, works fine on a Mac, and Picasa offers a free uploading utility for Macs that allows pictures to be sent to Picasa Web Albums directly from Apple’s (AAPL) iPhoto software.

I was surprised by how much I enjoyed the process of labeling photos with name tags. This provided a new way to sort images according to who was in each shot, and Picasa even found some hidden faces of friends I hadn’t seen in photos, giving me a new perspective on an old picture. Of course, the system isn’t perfect. A few things — including a lamppost — were falsely identified as faces in my photo albums, and it even requested name labels for the faces in photos I took of Renoir paintings.

There’s no way to completely turn name-tagging over to Picasa; you must manually assign a name to each face. But this discovery process grows smarter the more it is used, returning accurate, selectable name-tag suggestions below each photograph. A People page lists all the people whose faces appeared in uploaded photos, and I started relying on this as a quick reference tool. A photo name tag can include a nickname, full name and email. If someone is already listed in your Gmail contacts, these data are automatically retrieved and entered as you begin typing a name.

A Sync button at the top of each album in the Picasa desktop software assures users that any changes or edits made to photos in albums on the desktop will automatically be reflected in the Picasa Web Albums. I tested this many times, and uploaded photos changed quickly to match the desktop copy.

Picasa 3 offers customizable photo collages and Picasa Web Albums uses name tags to label faces in photos.

Instead of uploading photos from Picasa 3 to Picasa Web Albums and then sharing them from there, users can now hit a Share button in Picasa 3 that uploads images and emails them in one neat step. Privacy status on all albums is clearly marked, both in the desktop software and online in Picasa Web Albums, so you know if your album is private or public. These options can be adjusted in Settings, where the language used to describe sharing conditions is very clear. I liked the useful editing tools in Picasa 3, including an automatic crop tool that generated three cropping suggestion previews per photo.

Getting the Red Eye Out

A new automatic red-eye removal tool returned accurate results; it was easier to use than most because it identified red eye for me so I could fix it with one click. “Fill light,” a standby in Picasa, is a movable scale that adjusted and brightened dark, shadowy photos that were originally hard to distinguish. I even found photos that I had not previously seen in their entirety — including shots of the inside of Notre Dame Cathedral and a favorite photo of me with friends in front of a sunset.

Along with these other features, Picasa 3 has a shortcut button for easy uploading to Google’s Blogger service and one-step Geotagging, which adds location tags to photos. This software also includes a nice-looking built-in photo viewer for looking at all images on your PC. Picasa Web Albums has a mobile component and a new way of finding public photos from around the world, called Explore, which reminded me of searching on Flickr.

If you’re looking for a richer photo-sharing service that doesn’t confuse users when it comes to privacy, Picasa 3 and Picasa Web Albums are well worth your time. And name-tagging will change the way you sort through photos, though it would be more useful if it was available in the Picasa desktop software, as well as on Picasa Web Albums.

Edited by Walter S. Mossberg

Write to Katherine Boehret at mossbergsolution@wsj.com

The once-frustrating process of sharing digital photos and videos has noticeably improved over the past year, thanks to seamless Web-based programs that work like desktop applications. But many of these sites give all the power to whoever created the album, leaving invited guests to simply look at photos or add comments.

Shwup by muvee Technologies gives friends a common album in which to share digital photos and videos.

This week I tested shwup (www.shwup.com), a free Web-based application that’s available starting Wednesday from muvee Technologies and works as described above with only a few pitfalls. The concept is simple: Anyone who signs up for a shwup account can create an album filled with digital photos and videos, and this album can be shared with anyone else via email whether they have a shwup account or not. Recipients of these email invitations can click on an embedded link to view and add content to the album. Or users can completely skip visiting the site and instantly upload content by replying to the email invitation with attached photos and videos.

Muvee Technologies is best known for selling software that automatically creates short movies, or muvees, by blending digital videos and photos with music and transitions. Muvee’s namesake technology is a part of the free shwup site; a few muvees are automatically generated in each of the albums and everyone who is invited to the album can create muvees using its content. But shwup’s main focus is making sharing easier for everyone. It differs from most of the company’s software programs in that it’s free and completely Web-based.

A shwup album takes just a few minutes to set up and even less time to share. It works on Microsoft’s (MSFT) Internet Explorer and Mozilla’s Firefox 2.0 and 3.0 browsers but won’t work on Apple’s (AAPL) Safari until the fall. Shwup is available Wednesday but is still technically in its beta, or testing, phase, and I ran into a few kinks. I had trouble getting its useful reply-to-email uploading capability to work when two friends and I tried to upload content to my album using attachments in email replies. My friends had to visit the site to upload content. Muvee couldn’t figure out what went wrong when I asked the company about it.

I did, however, add content to someone else’s album using the reply-to-email method, uploading a digital photo in seconds. And in another instance I received a shwup email invitation on my BlackBerry and replied to it with an attached photo, which — in seconds — sent that photo from my BlackBerry to the specified shwup album.

Shwup automatically makes muvees, or short movies with music and transitions, using album content.

A glaring omission from shwup is the ability to view photos in full-screen view, a feature that most photo-sharing programs offer in slideshow mode. A friend of mine said he would use shwup over other photo-sharing Web sites that require user names and passwords if only it had full-screen photos. Muvee recognizes this as one of shwup’s biggest issues and says it will add this feature in August.

I uploaded over 60 high-resolution digital photos into my first shwup album, noting that the only limitation on files is that no individual file can be larger than 100 megabytes. These images can come from your computer, Flickr, Facebook or any Web site. Out of curiosity, I plugged www.cnn.com into the Web site entry box and shwup automatically grabbed images from the site that were available for me to use. I checked two of the images and they were added to my album in seconds.

Shwup automatically made and added three muvees to my album, using my photos put to music it chooses with dramatically timed transitions. These short clips looked really well-done, and were labeled as “sample muvees” so as not to be confused with my content. I followed a few simple steps to create a muvee of my own for the album by dragging photos into a tray, choosing from seven different layout styles and a handful of stock music licensed by shwup.

An option lets you upload your own music to play with your muvee, which I did. Seconds later, my homemade muvee played with transitions that were perfectly timed to the beats of a Fountains of Wayne song. After filling an album with digital photos, videos and muvees that I made, I invited friends to my album using emails generated from shwup.com. Within each album, a clear list of whoever was invited to the album can be seen on the top right side of the page. If someone hasn’t shared content yet, he or she can be “poked” by anyone invited to the album, sending them yet another email invitation.

Everyone invited to an album receives notifications from shwup whenever someone contributed content to the album and everyone can change the layout of the album to one of three settings: Grid, Simple or Mosaic. Moving my cursor over an album’s images showed data about each file including who contributed the photo or video, when it was captured and how many comments it had received in the album. (Comments are readable after clicking on an image to see a bigger version of it.)

Digital videos are labeled with small Play icons to distinguish them from digital still images. But a friend who uploaded a video to my album pointed out that the still image representing his video was a gray square rather than a still of the first scene as it did with the other videos — perhaps because this is where the camera was focused at the start of the video. Without an image to illustrate what the video was, it wasn’t as appealing as the other videos and images. Muvee explained that the ability to select a still image to represent a video was available in its pay software, but not yet in shwup, though the company plans to add this to shwup in the future.

Another hitch: If you invite someone to your album and then add something to the album you’d rather they not see, you can’t un-invite the person. Muvee says it plans to add the ability to un-invite members in July. Individual contributors have the ability to delete or “unshare” the content that they added to an album, while album creators can unshare and delete all pictures or entire albums. Album creators also are given the authority to merge albums.

Along with shwup, muvee also announces a new version of its downloadable pay software Wednesday: muvee Reveal. This $100 software has much more detailed features that specifically tweak your videos to become extra personalized.

When it works, shwup serves as a neat, artistic way to share photos quickly. Friends and family will be relieved that it doesn’t require any forgettable usernames and passwords, and the email-uploading tool will make anyone who knows how to attach something to an email feel like he or she can contribute to a photo-sharing Web site without a second thought. After shwup adds its full-screen photo-viewing option and clears up the glitches of its email-uploading feature, I’ll be using shwup for many group events to come.

Edited By Walter S. Mossberg

• Email mossbergsolution@wsj.com

But several companies now sell wireless mice designed especially for laptop users for whom the laptop touch pad just won’t do. These mice are small, sleek, colorful gadgets that more fashion-conscious computer users can happily show off in an airport, in a coffee shop or on campus.

See a chart comparing the three mice

This week I tested three entry-level mobile mice designed for laptops, from Logitech (LOGI), Microsoft (MSFT) and Kensington Computer Products Group. These $30 mice include a USB receiver that plugs into a laptop, allowing the mouse to work wirelessly. When not in use, this receiver fits snugly beneath the mouse, turning its power off to save battery as it snaps into place. These mice are also somewhat smaller than regular mice so they can easily slip into a laptop bag.

Mobile mice are now more stylish than the traditional desktop mice, and like laptops and digital cameras, come in various shapes and colors. The mice I tested are available in pink, white, red, blue, orange and gray. Next week, the Microsoft mouse I used will be available in shades of pomegranate, aloe, dragon fruit (dark pink) and milk chocolate; a khaki-colored shade called crème brûlée will follow in June.

I tried Logitech’s $30 V220 Cordless Optical Mouse in black, Microsoft’s $30 Wireless Notebook Optical Mouse 3000 in aloe, and Kensington’s $35 Ci75m Wireless Notebook Mouse in orange. To gain some perspective on high-end mobile mice, I also looked at two pricier options from Logitech: the $50 V470 Cordless Laser Mouse with Bluetooth (instead of a USB receiver) and the $70 VX Nano Cordless Laser Mouse.

My vote for a favorite low-end mobile mouse had me struggling between portability and comfort. But overall, I found that the Logitech V220 offered the best combination of small size and usability. The Microsoft mouse was also comfortable to use, but its slightly bulkier size made it less portable, and it didn’t feel as sturdy as the Logitech. While the Kensington was the flattest and most portable, it wasn’t as comfortable to use as the Logitech or Microsoft mice.

To conserve battery, all three of these mice go into low-power mode after 10 minutes of nonuse, but none of them turns off completely. Battery indicators light up when juice is running low. According to company estimates, the Microsoft mouse has a battery life of over six months and the Logitech mouse has a battery life of up to six months. The Kensington mouse’s battery life was estimated to be three months. I didn’t use any of them long enough to prove the company claims.

These mice are compatible with Macs and PCs, and are plug-and-play — meaning you don’t need to install any additional software to make them work. I used each on laptops running Mac OS X and Windows Vista without any problems. The Microsoft and Logitech mice also can work with their own special software programs, but the extra features, such as reassigning a mouse button to open an application, aren’t really necessary for the average user.

The $30 Logitech V220 fit comfortably in my hand, with rubber grips on its sides and a generously sized, smooth-gliding rubber scroll wheel that made it easy to use. This scroll wheel can be nudged to the left or right for horizontal scrolling, a feature found on most of Logitech’s mice.

Unlike the Microsoft and Kensington mice, which show flashing red sensor lights, the Logitech uses an invisible optic sensor. This sounds cool, but because the mouse doesn’t use any lights, it can be left on accidentally. I did this a few times before remembering to stow the USB receiver in the mouse to automatically turn off its power.

Of the three, the Logitech mouse was the only one with a manual on/off switch — so you can turn it off without snapping the USB receiver into place in the mouse. This could save frequent travelers from having to detach the USB receiver every time they want to turn off the mouse, and could let people keep the receiver plugged into the laptop.

Kensington’s $35 Ci75m was the flattest mouse by far, making it a cinch to slip it into the outside pocket of my already full laptop bag on a train trip to New York. And this mouse has a bonus feature: It can work wirelessly or with a USB wire, which wraps up inside the mouse and serves as a backup in case the mouse runs out of battery. I tested this by removing the batteries and using only the USB wire, and it worked like a charm.

I also liked the way the Kensington USB receiver disappeared into the body of the mouse, while the Microsoft and Logitech receivers protruded a bit when stowed, adding to the thickness of the mouse when tucked into a laptop pocket.

But though this bright orange mouse received approving feedback from passersby, it wasn’t all that comfortable to use after a while. Its flatness saved room in my bag, but didn’t give my hand much support. It also felt flimsier than the Logitech, and its small wheel wasn’t as satisfying to use.

I received early test units of Microsoft’s $30 Wireless Notebook Optical Mouse 3000 in aloe, pomegranate and milk chocolate.

This mouse has rubber sides for a better grip, like the Logitech, and an arched shape for comfort. Its wheel is slightly smaller than Logitech’s, though its overall size was bigger and more like that of a regular mouse — not one designed specifically for mobile use. But even though the Microsoft mouse was larger, it didn’t feel as solid as Logitech’s; rather, it felt more like the thin Kensington. Its right and left buttons felt less stable, and its wheel didn’t roll as smoothly.

I did like Microsoft’s nod to new colors, and the aloe — a cool hue of green — was my favorite.

For people who don’t mind spending a little extra money on a mouse, the $50 V470 Cordless Laser uses Bluetooth, eliminating the need for a USB receiver altogether. It took only a couple seconds to pair this mouse to a MacBook with built-in Bluetooth, and it worked smoothly. A manual on/off switch on this mouse’s underside can help to conserve battery.

The $70 Logitech VX Nano Cordless Laser is sleek with shiny black accents and a silver-edged wheel. The “Nano” in this mouse’s name refers to its ultra tiny USB receiver, which sticks out only about a quarter of an inch when plugged in, so it can be left in a laptop at all times for ease-of-use. If needed, this receiver can be hidden away in the cavity of the mouse, under a snap-on lid. I used the VX Nano to glide around Web pages and Word documents with buttery smoothness.

No matter what mouse you choose to use with your laptop, most will be considerably more comfortable than touch pads and trackpoints, especially while working on long, mouse-intensive projects. But of the three lower-end mobile mice, the Logitech V220 Cordless Optical Mouse delivers the best combination of comfort and transportability.

The chart below (click on it to make it larger) compares features of the three mice described in this column.

Email mossbergsolution@wsj.com

Digital Cameras

Megapixels: This term describes the highest resolution photo a camera can take. Often mistaken as the most important factor in a digital camera, a high megapixel count — such as 10MP or more — isn’t necessary for the average user unless he or she plans on heavily editing or enlarging photos. Most new digicams offer between five and eight megapixels, which is usually more than enough.

Optical or Digital Zoom: Optical zoom, determined by the physical movement of a lens, matters much more than digital zoom, which digitally alters an image using the camera’s internal computer. Camera companies still try to confuse potential buyers by listing a camera’s total zoom, or the optical and digital zooms multiplied together. Ignore total zoom numbers and instead focus on optical, which now averages around 5x for many new cameras.

Image Stabilization: When generously sized LCD viewing screens started replacing optical viewfinders, they also forced users to hold their cameras at arm’s length, making for plenty of blurry photographs. To remedy this, camera manufacturers have added image stabilization, tools once found only in high-end SLR models. Optical (also called “mechanical”) and digital image stabilization correct for unsteady hands and moving subjects, respectively. Cameras with both types advertise dual image stabilization, which corrects for both situations and costs more.

Mobile Devices

HSDPA and EVDO: HSDPA, or High Speed Downlink Packet Access, is the name for AT&T’s 3G, or third generation, mobile network that operates at roughly the speed of a slower DSL in a home. HSDPA is available in most major metropolitan areas and is seen as the competitor to Verizon and Sprint’s EVDO (Evolution Data Only) networks, though the popular iPhone runs on AT&T’s network using Wi-Fi and EDGE technology rather than HSDPA.

Multi-Touch Technology: Most popularly found on Apple’s iPhone and iPod touch, multi-touch is starting to show up in other products, such as in Microsoft’s Surface, a coffee-table-like computer. Rather than just responding to on-screen touches, this technology enables moving, resizing and zooming pictures and Web pages using one or more fingers simultaneously. Look for many more devices — mobile and otherwise — to incorporate multi-touch in the future.

GPS: Global Positioning Systems are most often found in cars — either built-in or on portable devices from companies like Garmin and TomTom. These gadgets use satellite technology to determine geographic location, and high-end models even display Web content like news and weather along with directions. GPS integration in mobile devices can be used to plot routes in cars, can help users find nearby businesses while on the go and can link friends by showing one where the other is located and what they’re doing.

Digital Music

DRM: Digital rights management is a set of standards that protect the intellectual property rights of online content like music and videos, preventing it from being illegally distributed across the Web. In the past year, Vivendi’s Universal Music Group, Apple and (most recently) Sony BMG said they will start selling DRM-free versions of songs, often for a higher price. In Apple’s iTunes store, these files are called “iTunes Plus” and aren’t restricted like other iTunes content.

MP3: MP3 files are open, without any DRM restrictions. Files that you rip (copy) from your own CDs are usually converted into MP3s, though iTunes users can automatically rip tracks into that program’s special format, called AAC. MP3 files can be uploaded to social-networking sites for sharing with friends and online communities.

These file types are protected by rights that tie them to specific players. Generally, AAC files make up the majority of tracks sold on Apple’s iTunes store and play only on Apple’s iPods; WMA files are Microsoft’s version of proprietary files.

Wi-Fi

The popularity of Wireless Fidelity, or Wi-Fi, brings this technology to more and more portable devices like the iPod Touch and Microsoft Zune and gives companies good reason to incorporate Wi-Fi receivers in new computers — laptops and desktops alike. While available in many flavors, different letters like b, g, a and n stand behind Wi-Fi’s more technical name, 802.11, to help discern one version from another according to characteristics like speed and compatibility. The latest version, “n,” offers the greatest range and speed, and “n” devices are usually compatible with earlier versions.

Televisions

HDTV: High-definition television has now become the standard, capable of displaying vastly better pictures, provided the source is also HD. Today’s more popular flat panel HD televisions are LCDs, or liquid crystal displays, though plasmas still hold their own. Recording HD content can’t be done with a regular digital video recorder; instead, a special HD recorder is required to capture this higher quality content.

480p vs. 1080i vs. 720p vs. 1080p: These numbers refer to the resolution, or sharpness, of a digital display, while “p” stands for progressive and “i” stands for interlaced. A resolution of 480p, known as EDTV or Enhanced Definition TV, is found most often in low-end plasmas or LCD screens. A TV with a resolution of 1080p is currently considered the Holy Grail, and costs the most. But 1080p pictures usually can’t be distinguished from less expensive 1080i or 720p pictures by average viewers at the typical distances from which most folks watch TV.

Blu-ray vs. HD DVD: Blu-ray and HD DVD are incompatible high-definition disc formats that continue to fight a seemingly endless battle to replace the DVD. The Blu-ray camp is led by Sony and the HD DVD camp is led by Toshiba. The two formats aren’t so different, technically speaking, but their very existence is confusing to consumers. The recent decision made by Time Warner’s Warner Bros. to use Blu-ray gives Sony’s side a boost, and now Viacom’s Paramount is rumored to be switching to Blu-ray from HD DVD. Dual-format players from Samsung and LG offer some solace.

Email: mossbergsolution@wsj.com

Tubes installs a program on the desktop (right) into which files can be dragged and shared using automatic synchronization.

This week, I tested another product in the long line of programs that uses automatic synchronization to simplify the process of sharing large files by giving you the ability to change files and privacy options at any time. It’s called Tubes (www.tubesnow.com) from Tubes Networks and it takes its name from the pneumatic vacuum-tube system commonly used in bank drive-throughs that motivated me to join my Mom on visits to the bank as a kid. Mom would pull up and a container would whoosh over through a tube to arrive beside the car window; after a quick exchange it returned with her deposit slip and a lollipop for me.

Tubes aims to work with the same sort of magic. Once installed, its desktop application stays opened on your computer as a place where “tubes” are made for sending files. Any type of file can be dragged, dropped and sent off to share with other people using these virtual tubes. As soon as you release data into a tube, a whoosh sounds (like that of the vacuum tube) and your files are encrypted and uploaded to the Tubes server.

Invited guests view your tube’s data in its full, uncompressed format. The owner of the tube always has the final say on what is shared with whom, and changes made to tubes on your hard drive are detected instantly via automatic synchronization, guaranteeing viewers will always see the latest version of the tube. Shared tubes are also accessible via the Web, saving viewers from downloading the Tubes desktop program.

Other products like Sharpcast (www.sharpcast.com) and Pando (www.pando.com) also offer ways to share large digital files; Sharpcast uses synchronization similar to that of Tubes — it all happens behind the scenes without any work on the user’s part.

Tubes is available in a free version that provides a gigabyte of storage, or in paid versions with five, 10 and 20 gigabytes of storage for $6, $11 or $21, respectively.

Most of the time, Tubes worked well for me when I installed it on two Windows machines, one running XP and one running Vista. Tubes’ smart use of an already familiar process — dragging and dropping — gives you the impression that you already know how to use it and makes sharing files seem easy. I started dragging all sorts of files into tubes that I created, naming them and labeling them with a representative icon (one of 10 offered by Tubes or one of my own images).

For all its usefulness, Tubes certainly has room for improvement. For now, there isn’t a Mac version of the program, and when friends and I tried accessing shared tubes using a Mac Web browser, the results were inconsistent and sometimes didn’t work at all. Windows Vista had its own issues. After installing Tubes on my Vista laptop, an error message labeled “invalid argument” made me feel like a member of the debate team. And I couldn’t see thumbnail images of photos in my tubes using Vista, though I could on Windows XP.

Today, Tubes is releasing an updated version of its program that aims to improve the usability and look of the product, including refining the processes of sharing tubes and looking at tubes via the Web.

Before sharing tubes, I adjusted the permissions granted to each guest by labeling them as a Reader, Author or Editor; only the Owner can invite others to view a tube. But these labels can get confusing. More than once, I granted guests the highest level of permission, which is Editor, allowing them to make changes to the files in my tube, only for the guest to be asked for his registered Tubes email and password, which an invited guest shouldn’t need.

The Tubes experience was best when the recipient of my Tubes invitations had the application installed on his or her desktop.

After installing Tubes on a computer at work, I installed it on my home PC and easily auto-synched tubes that I created at work onto my home PC — a big plus.

Tubes incorporates the Web by assigning a unique URL to every file in every tube, and every tube automatically generates its own Web site, or “tubeSite,” as it’s called. Individual URLs for each file can be found by right clicking on a file and selecting an option to copy the URL into an email or browser. I copied the URL of a shared MP3 audio file and pasted it into my browser; it played a Fountains of Wayne song with no problem. But sharing these URLs with others is only possible if the owner gives permission.

Comments about tubes can be made in the “tubeBlog” — accessible through any tube in the application or online. I created a tubeBlog for a tube with photos from one of my vacations, adding descriptions and comments to specific photos. Others, with my permission, could do the same, using the photos from the tube or just leaving comments.

A friend used Tubes to share photos with me while vacationing in Italy and Amsterdam. I added my own travel photos and an itinerary made in Microsoft Word to his tube and changed the tube’s title; these alterations synched instantly.

Even if you aren’t online, you can access tubes or make changes to them by dragging files in or taking them out; updates are made automatically the next time your computer connects to the Web.

Tubes is off to a good start, but it needs to improve its system to make permission levels more understandable for tube owners and those invited to see a shared tube. With a few improvements, Tubes could be a product that I’ll continue using on Windows computers long after this column.

Email mossbergsolution@wsj.com

Write to Katherine Boehret at katie.boehret@wsj.com

Apple’s new iMac comes loaded with iLife ‘08 software.

But Apple’s bigger change was a major update to its iLife software suite, which comes loaded on all its Macintosh models — not just the new iMac — and can be purchased by existing Mac owners for $79. The suite includes iPhoto, iMovie, iDVD, iWeb and GarageBand — programs that help average people organize, edit, share and publish photos, videos and music. These uncluttered and intuitive programs have been best of breed, so Apple’s decision to update iLife is intriguing, if for nothing other than to see what major improvements could really be made.

This week I tested iLife ‘08 on a new iMac — the midrange $1,499 20-inch model with a 2.4 gigahertz Intel Core 2 Duo processor and a 320-gigabyte hard drive. I focused especially on iPhoto and iMovie, the anchors of the suite and the programs that got the biggest overhauls. One significant change in iPhoto is its new method of organizing photos by sorting images into “Events” according to their dates, rather than by the batch in which they were uploaded to your computer. The iMovie program underwent a more drastic overhaul, adding a library for storing all of your video clips and a new interface for organizing those clips into a movie that dispenses with the traditional timeline design long used in digital video software.

Both iPhoto and iMovie now use “skimming,” a rich feature that lets you scan through photos or videos just by passing your cursor over a thumbnail. And if you have an account on Apple’s online .Mac service ($100 annually), both programs offer effortless one-click photo or video uploading to a “Web Gallery,” where you can share your content. Videos can also be uploaded directly to YouTube without a .Mac account.

Before delving into the software, a quick word about the new iMac is in order. It’s an improvement on an already stellar computer, with beefed-up specs. There are four models, from $1,199 to $2,299, in two screen sizes — 20 inches and 24 inches. The base 20-inch model costs $1,199, a price cut of $300 from the prior 20-inch model. The base 24-inch model now costs $1,799, down $200 from the old model of the same size.

The biggest adjustments for users will be the screen and keyboard, which took me a few days to get used to. The new iMac comes with a glossy screen, which makes colors pop but also reflects more background light than a traditional matte display.

Radical Keyboard

The keyboard is radical-looking. It’s much flatter and sleeker than typical desktop PC keyboards. I found it easier to type with, but in an attempt to make it more like that of a laptop keyboard, Apple rearranged some built-in key functions, which was confusing at first. If you hate it, you can still use an older Mac keyboard or any USB keyboard, even those meant for Windows computers. For now, the new iMac offers only a wired keyboard. A small wireless model is due in a few weeks.

I quickly picked up on how to use the new features in iPhoto and iMovie, thanks to unintimidating, self-explanatory icons. The Events feature in iPhoto might be a pain for users who are transferring numerous already-organized albums from the previous version of iPhoto into this one, as not all albums will perfectly translate into Events. But it’s a great improvement over the old method — and over Windows photo programs I’ve tried — for organizing newly shot photos.

The new version of iPhoto will look familiar to anyone who used the older version; its layout is the same, with a list of your photo library on the far left and a large display area to the right of this list. I uploaded a couple of albums at once, and each was automatically sorted into its own event because the photos from each were associated with two different dates.

Skimming the Thumbnails

A few new features stand out at a glance. When photos are grouped into Events, these are neatly marked with one large thumbnail image that is selected to represent the entire pile of photos. By passing my cursor over this top thumbnail, I skimmed through all of the images in that Event in mere seconds. A button labeled Web Gallery instantly uploads images to a .Mac account, and a list of photos that are shared online appears in iPhoto.

The updated iPhoto automatically groups photos into Events represented by thumbnails that make for faster photo browsing.

Rather than deleting images that I didn’t want in a particular Event, I selected the new Hide icon, which takes marked images away from view but notes the number of hidden photos at the top of the Event as a reminder. Hidden photos can also appear within the Event, denoted with red X marks.

Double clicking on any image now magnifies it without opening editing functions, letting users quickly see larger versions of each shot. Editing in iPhoto was already straightforward, but new options provide more customization; for example, red eyes can be removed with a cross hairs (like the old iPhoto) or by using a circle that manually adjusts to match a subject’s pupil size.

The new version of iMovie is deliberately designed to steer away from the familiar interface most consumer video-editing programs use, which was borrowed from professional-grade software. Instead of the usual timeline of clips, iMovie employs a more free-form canvas where clips and effects can be assembled. Apple knows that this may irk people used to the traditional method, but believes it will make video editing much less intimidating for casual users.

To test iMovie, I used a high-definition Panasonic video camera to capture amusing moments around my office and brought it with me to Boston for three days so I could document my sister’s move into her new place (the moving guys were thrilled). In both places, I turned the camera on and off numerous times, capturing short clips.

Instant Recognition

My video camera was instantly recognized when I plugged it into the iMac, prompting iMovie to generate thumbnail images of each clip. Times when the camera was turned on or off were clearly marked, and I chose the clips I wanted to import. Transferred content appeared in the new iMovie library at the bottom half of a screen, and I dragged and dropped clips to the top half of the screen to add them to a project. Clips can be selected by using your cursor to draw a yellow box around the whole clip or just a part of the clip that you’d like to use. Skimming through content is helpful here — as I moved my cursor from left to right through clips, the audio and video played in the top right of the screen, letting me see and hear footage so as to select exactly where to trim a clip.

The new interface for iMovie is more approachable for everyday users, with a smart library that organizes Projects and Events into two different libraries.

After dragging various clips to the top half of the screen, I added special features like music, sound effects and title slides to my project. These were all added the same way my clips were: by dragging and dropping to put the right thing where it needed to go. Music from iTunes can be used with videos, or Apple provides over 500 different sound effects and tunes.

Still photos can be incorporated into iMovie using a “Ken Burns” effect (panning across a still image) to keep the video’s pace moving along. And any videos captured on a digital camera that were uploaded into iPhoto can be retrieved and used from within iMovie. If footage is too dark, it can be automatically or manually adjusted, like images in iPhoto.

Polished Results

In just about 15 minutes, I created a short movie that mashed together various clips from three days of moving. I added titles to introduce the movie, and transitions in between each clip that looked really polished.

I uploaded photos and videos to the .Mac Web Gallery, checking off the privacy option (passwords can be set to limit who sees the content). Other options to check include showing titles of photos; enabling a feature that lets others upload images to my gallery via a set email address; and letting other people download high-resolution versions of my content. In one step, videos can also be uploaded to YouTube.com or transferred to your iTunes library, where they can be viewed on a PC or Mac, or moved over to an iPod or iPhone.

The new programs in iLife ‘08 are a pleasure to use, and the new iMac is a great way to experience them.

Edited by Walter S. Mossberg

Email: mossbergsolution@wsj.com.