The G1 is built around a model of openness, enabling developers to create applications — software programs, called “apps” for short — that will succeed or fail according to the feedback from the online community. Naturally, these community-contributed programs need a marketplace where G1 users can find them, and the Android Market provides just that.

This week, I installed various applications from the Android Market on a G1 and tested them out. Google (GOOG) says it will launch with around 40 to 50 applications in this virtual store, and these and all other apps will be available free of charge from now until at least the start of next year.

BreadCrumbz makes maps.

I found these apps to be useful, entertaining and mostly straightforward. There were a few that I felt tried to jam too much into one application, such as BreadCrumbz, an app that asks users to add pictures, instructional arrows and labels to maps that they make for friends. Other apps kept it short and sweet, like Wi-Fi Toggle — a one-touch button that turns wireless capability on or off to save battery power.

The G1’s apps are more utilitarian than most apps I’ve tested for Apple’s iPhone — and not quite as visually pleasing. I even compared one G1 program, Plusmo College Football, directly with the same app running on the iPhone, and I missed the artsy touches of the Apple (AAPL) version — like menus that flipped 180 degrees when selected rather than simply opening.

One downside: Only a measly 70 megabytes of internal flash memory are reserved on the G1 for storing these third-party applications. Once you fill that limited internal storage space, you have to delete some of your apps to add more. You can’t currently store apps on the phone’s roomier removable memory card. (A one-gigabyte microSD comes with the G1.) The iPhone doesn’t set such an arbitrary limit on application-storage space. The Android Market, like Apple’s iTunes, keeps a record of each user’s installed apps so they can be easily downloaded again later at no extra charge (if they carried a fee). But, unlike the iPhone, the G1 can’t back up your apps to a PC or Mac.

The G1’s open model means extra setup steps during app installation. For example, if an application will access certain information — such as a user’s Internet connection, location data (as identified by GPS) or other personal information (calendar, contacts, etc.) — warnings appear during installation, and the user must grant permission. In addition, many apps come with license agreements that must be okayed before users can continue. If something goes wrong with an app, people can post complaints on community boards or email developers, whose email addresses appear during installation.

The Android Market home page.

To offer a general idea of what’s available, I’ve highlighted a handful of apps that I like. I broke the applications into three groups: Functional, Fun (if occasionally kitschy) and Frills.

Functional

Wi-Fi Toggle: This does what it says. Once installed, it adds an icon to the G1’s desktop that provides a quick way to turn Wi-Fi on and off without digging into the settings menu.

Locale: Like Wi-Fi Toggle on steroids, this app allows a user to set up a G1 so it dynamically changes its settings in specific conditions. The settings can respond to calls from certain people or changes in the phone’s battery power, calendar, the user’s location or the time. For instance, the Wi-Fi can automatically turn off, ringer volume can go up or down, desktop wallpaper can change or a post can be sent. Just think of all the churchgoers who could ensure their cellphone ringers are turned off on Sunday mornings or when the church’s location is sensed.

Ringdroid: Make ringtones from your own songs by adjusting bars to mark the start and end of each ringtone. Hitting Save automatically keeps the ringtone, labeled with the song’s name by default, for use on the phone.

Video Player: The G1 doesn’t have a built-in way to play videos, and this app does the trick in a clear-cut, reliable way.

Fun

Movie ShowTimes: This lets people use a finger to flick across the G1’s touch screen to page through movie poster images, titles and brief descriptions. Below each movie description, an on-screen button labeled “Showtimes Near You” uses GPS to generate lists of nearby movie times.

Pac-Man: The classic arcade game never gets old. You can move Pac-Man through his maze with one of three methods: tilting the G1 so its accelerometer moves the Pac-Man, swiping with a finger to point Pac-Man in the right direction or using the trackball to move him around the screen. I preferred the trackball.

Cooking Capsules: This program demonstrates food-making without being either too intimidating or too dull and simplified. Though there were only six “capsules” when I tested it, each includes steps for watching (an instructional video), shopping (using an on-screen list of items) and cooking (with numbered instructions on how to cook the food).

Bonsai Blast is a gaming app that’s now available for the G1.

Bonsai Blast: This colorful, Asian-themed game directs people to shoot colorful marbles at other chains of marbles, with a goal of getting three matching marbles lined up beside one another so they’ll disappear.

Krystle II: Turns your G1’s entire screen into a picture of fur that purrs and vibrates as you touch it. There’s no real point, but Krystle II is addictive and strangely comforting during long conference calls.

Frills

Ecorio: This well-intended app aims to track users’ travel carbon footprints in order to make them more responsible for the environment. It asks users to enter things like recent transit routes and carpools and suggests ways to reduce and offset people’s footprints.

Maverick: An IM program that allows people to add scribbles, location data or even photos to active instant-messaging conversations. Maverick signs users into Google Talk and Picasa simultaneously, adding IM images into an auto-generated Picasa album for later viewing.

PicSay: Add word balloons, titles, props and effects to digital photos captured and/or stored on the G1, then send the images via multimedia messaging service or email, or save one as a caller ID.

There are many more G1 apps to try, and developers are expected to keep making them for this new device. As with the iPhone, apps obtained for the G1 from the Android Market enable it to morph into a different device with different tools every day.

– 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

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This week, I took a look at just a few Web sites that make finding these videos easy, including Howcast Media Inc.’s Howcast.com, WonderHowTo.com from WonderHowTo Inc. and eHow Inc.’s eHow.com. Howcast.com, which launched in February, encourages users to make and share good-quality, entertaining videos by providing tools on its site, and has about 5,000 videos so far. WonderHowTo.com, launched in January, used a different strategy by aggregating over 110,000 videos from various sources — including Howcast, YouTube and Scripps Networks (SSP) — rather than publishing its own content. EHow, a site that started in 1999 with text-only content, contains over 100,000 instructional articles submitted by its users or eHow editors, and has a small catalog of videos.

Howcast videos can be seen in full-screen mode using a player that illustrates step-by-step text instructions beside video screens.

After testing each of these sites, I found that my favorite how-to videos had steps that were clearly labeled and numbered and the ability to fast forward to or play back specific parts in the video — tools that Howcast included in almost all of its videos. At least some of the videos on the three sites simply illustrate things you could likely figure out how to do without watching a video, such as “How to Make Green Beer.” (Add food coloring.) Howcast.com and WonderHowTo both require users to sign in, which confirms their date of birth, before looking at what they consider “mature” content.

These three free sites are advertisement-supported, and Howcast’s ads run alongside videos. WonderHowTo.com runs ads at the top and side of its own site, on which it will play certain videos. But because videos on WonderHowTo come from other sources, those other sites can show video-embedded ads according to their rules. EHow’s videos run pop-up text advertisements displaying names and links of other related (and sometimes unrelated) Web sites. But I couldn’t get the pop-up ads to stay closed.

Overall, I preferred the look of Howcast’s site and its well-organized videos. But its content paled in comparison to WonderHowTo’s 110,000 videos and even eHow’s 100,000 instructional articles. WonderHowTo.com does a nice job of gathering content from across the Web, though the inconsistencies of other sites (including advertisements, layout and video player) were a bit frustrating. EHow’s articles were useful, as were its few videos, but I couldn’t get over the site’s unyielding video pop-up ads.

Howcast.com’s content was informative with an amusing edge, including a video titled “How to Tell If Your Boyfriend’s A Psycho.” (If he calls 50 times a day, for example.) Other videos on the site are more serious, like “How to Make Sushi” by an executive sushi chef in New York City.

The founders of Howcast Media formerly worked in Google’s (GOOG) video department, including during the acquisition of YouTube. All of Howcast’s content comes from one of four sources: written and produced by Howcast in its studios; emerging filmmakers who apply and are accepted into the Howcast Directors Program to receive $50 a video and 50% of the advertising revenue generated from videos that generate over 40,000 views on the site; content partners like Popular Science; and Howcast users’ personal how-to videos.

In order to make it easier for average users to upload better-looking videos, Howcast provides an Upload and Enhance tool that simply and quickly adds professional-looking graphics and printable steps to go along with how-to videos. This formula makes videos more enjoyable to watch.

Videos made in the Howcast Studios include accompanying music, good narratives and actors who add humor to an otherwise humdrum how-to. Among its helpful features is a video player that has smart blue markers to show where facts are sprinkled throughout the video and green markers to illustrate where tips appear. For example, the fact at the end of a video for beginner guitarists called “How to Play a Basic Bar Chord” is “The late Kurt Cobain claimed he was trying to rip off the Pixies when he wrote ‘Smells Like Teen Spirit. ‘” In full-screen view, users can zoom in on any part of a video, and written-out steps and thumbnail stills of the scene appear to the right of the screen.

Howcast tries to run ads alongside videos that relate to the content. A video titled “How To Clean Your Dog’s Teeth” has an ad for PetSmart (PETM) Stores running on its page.

WonderHowTo.com was developed by a former television executive with the intention of using the site to produce its own video, like Howcast.com. Instead, WonderHowTo.com opted to tap the vast selection of how-to videos already available on the Web.

A Browse button pulls down 35 categories from which users can sort content, including Spirituality, Dating & Relationships and Fitness. In the Fashion subcategory under Beauty & Style, I found 290 videos including one on “How to Tie a Windsor Knot” and another titled “How to Turn Old Underpants Into a Bra” — neither of which I’ll be using anytime soon. Other categories include Clip of the Day, Recommendations (for users who are logged in) and Fresh, where new videos are listed. Users can grade videos to help others tell which they think are the best, and a Top Grade category compiles the top-ranked videos.

WonderHowTo’s content comes from over 700 sites, according to the company. I used the site to find a video on YouTube about how to do a front-flip, clips on VideoJug.com that provided terrific tennis tips from a coach, and a video from EasyBarTricks.com about how to stick a beer bottle to a wall without glue or gum. (Hint: You’ll need a corner and a wall you don’t mind marking up.) WonderHowTo made it easier to find these videos than by performing a general search on the Web.

I submitted a non-how-to video to this site by simply entering a URL, without logging in. I never found the video I submitted on the site; WonderHowTo explained that it screens all videos prior to posting them, so it must have found my video.

EHow.com uses its database of articles to encourage people to watch videos, when they’re relevant. This site uses calm, pastel colors to give a relaxed feeling — especially compared with WonderHowTo, where banner ads surround the page. EHow’s 26 categories include Parenting, Parties & Entertaining and Weddings. Twelve subcategories within Weddings led to 23 articles about Bridal Party Responsibilities — a popular topic was “How To Deal With a Bridezilla.” Related videos, such as “How To Get Rid of Wedding Day Jitters,” ran along the right of the page.

Videos can also be found on eHow within a marked tab at the top of the page. But unlike the articles on eHow, these videos weren’t well organized or as easily searchable. I watched one of eHow’s Featured Videos called “How to Know if Your Toe Is Broken,” but after closing a pop-up ad for UPS (UPS) during Step One of the video, another ad popped up during Step Five. Neither ad had anything to do with broken toes.

But the eHow videos were professional-looking and included quite a few tips that I didn’t know. That broken toe video was submitted by the eHow Health Editor, and a link at the top of the page led me to hundreds of other health-related articles. I found another video on “How To Remove Wallpaper,” which was posted by the Home & Garden Editor and included a list of things I would need to proceed, along with numbered steps.

It isn’t always easy to learn from the information you find online, and how-to videos can be a big help — especially when they’re well-made and easy to find using one of these sites. Howcast.com has well-presented content that was enjoyable to watch, but WonderHowTo.com offers a better variety of instructional videos.

• Email mossbergsolution@wsj.com