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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Meanwhile, Microsoft’s Zune announced via press release that new players in different capacities and colors would be available this week, along with a software update.

Despite their different approaches, these two announcements shared a notable common thread: integrated music discovery. Each company’s new software features ways for users to find automatically generated suggestions of music they might like, the way Pandora Media Inc.’s popular personalized music lists do. Of course, music discovery also encourages users to buy more.

Apple’s new iPods include a thinner Nano with an accelerometer, which senses the direction a screen is being held in a user’s hands and flips the display horizontally or vertically. These Nanos come in eight- or 16-gigabyte versions for $149 or $199 and are available in nine bright colors. A new, thinner iPod Touch with a built-in speaker was also unveiled, and it comes in eight-, 16- or 32-gigabyte versions for $229, $299 or $399.

Microsoft’s two new Zune players come in 16- and 120-gigabyte capacities for $200 and $250, respectively. All Zunes have built-in FM tuners and wireless capability, but the new upgrade allows users to buy and download songs they hear on their Zunes’ radios via Wi-Fi, when available.

While Apple’s iPod has been a snowballing success for the company, its companion iTunes software is no slouch. To date, 65 million iTunes store accounts with associated credit cards have been set up on Macs and Windows PCs. But iTunes has always been weak on music discovery and community.

Apple (AAPL) calls iTunes 8’s ability to make smart music recommendations the “Genius” feature. The tool can automatically do two things after analyzing a selected song from your music library. First, it can generate a playlist of songs from tunes you own. Second, it can generate a list of songs you don’t own but might want to buy from the iTunes store.

MicrosoftZune’s Mixview feature displays content related to an artist with an explanation of the relationship.

Microsoft’s Zune software discovers and recommends music using categories called “Picks,” “Channels” and “Mixview.” The last of the three, Mixview, generates recommendations for other musicians and albums, as well as other Zune users with whom you might like to connect. The suggestions are based on the artist of the song you’re playing and are displayed in an interactive graphic that explains how each is linked — for instance, if your artist was influenced by a band or if a member of Zune’s social network is a top listener of the artist you’re playing.

After using the music-discovery software from Apple and Microsoft (MSFT), I felt like Apple’s Genius tool still had a lot to learn, though the company says it will improve over time as more people start using it. Zune’s software had some similar issues, but it offered recommendations in a richer, more engaging manner, encouraging me to keep digging around and learn more about my music. Though I didn’t happen to have as much time to use Zune’s software as I did Apple’s Genius, I got more out of my Zune experience.

Apple offers much more content at its iTunes store than Zune. In all categories, iTunes takes the lead: in songs, 8.5 million songs to Zune’s 4 million; in music videos, 10,000 versus 8,500; in television episodes, 30,000 versus 3,000; and in audio and video podcasts, 125,000 versus 6,000.

To analyze and learn from your music, Apple scans the contents of your music library, which may raise privacy concerns for some people. Apple says that the information it collects is completely anonymous, and that it does not and will not associate this information on its servers with you or your account.

Some of my Genius playlists were well-crafted, including songs that meshed well with one another. But outliers cropped up, such as when “Should I Stay or Should I Go” by the Clash was stuck in the middle of a list generated from Coldplay’s gentler ballad, “Green Eyes.” Some songs won’t generate playlists if you don’t have enough related songs in your library; this happened to me with the pop hit “Apologize” by Timbaland, featuring OneRepublic.

Songs from artists whose content isn’t sold in iTunes, such as The Beatles, won’t generate Genius lists, because Genius makes suggestions based only on what it sells in its iTunes catalog. Genius will soon work with songs beyond those sold in iTunes.

Genius has a bigger problem. If you hit “Play” in iTunes, a Genius sidebar appears to offer content related to a selected song. But as play continues, Genius doesn’t continuously generate new recommendations; instead, it’s stuck on the very first song that was selected — which you might have chosen two hours ago. This means music discovery must be a manual process, rather than an as-you-listen convenience.

Genius playlists can be made on a computer or iPod and sync back and forth. I synced Genius lists on two iPod touches, but this didn’t work in one test with an iPhone. Apple said it couldn’t replicate this problem and hadn’t had other reports of it.

Zune software never scans your music collection. Instead, it knows only the number of times you played a song and how you may have rated a song.

Zune’s Mixview adds a real zing to the discovery process. It is a kaleidoscope-like graphic that appears on the screen when a song, artist, album or friend’s Zune Card is selected. The selected item is surrounded by eight to 10 floating squares filled with graphics and text, each holding a related song, album, artist or graphic representation of a Zune listener who’s considered an “expert” on the selection.

Each of these related squares includes a line of text explaining its relationship to the center item. For example, as I played “(I Can’t Get No) Satisfaction” by the Rolling Stones, Cyril Davies appeared as a related artist; an image of Arthur Alexander appeared as an influencer of the Stones; a Zune community member with the tag “Rreynoso” appeared as the top listener for the band and other Stones albums were displayed.

Mixview changes as you explore it. When one of its recommendations is selected, a new Mixview is created around that selection, encouraging discovery. But Mixview has the same problem as Apple’s Genius: When one song ends and another begins, the Mixview graphic doesn’t automatically change; you must manually start Mixview for a new song. Zune says it doesn’t want to change the graphic in case a user is in mid-exploration.

Unlike Genius, Mixview shows songs and artists beyond what Zune sells online. But the company says Mixview does “favor” Zune content, and Zune Picks are limited to items sold by Zune.

Zune Picks and Channels are more passive ways of discovering music: Picks are generated for you in Zune Marketplace according to your listening habits. Zune Channels bring collections of music to Zune devices and software, but these are useful only for Zune Pass members who pay $15 monthly.

Apple’s Genius is a helpful tool when it comes to quickly making a playlist, and its iTunes sidebar might reveal fresh related content. But the Zune software truly allows people to discover more about their own music and that of others.

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 welcome sign is an effort by companies trying to improve Microsoft Corp.’s (MSFT) Windows Mobile operating system, which has a reputation for confusing navigation and hasn’t had a major update recently. Kinoma Inc., for example, recently released an application called Kinoma Play that runs on Windows Mobile devices and gives users a markedly better way of handling photos, videos, music and Web browsing.

The HTC Touch Diamond, due out this month from Sprint, tries to hide Windows Mobile software.

This week, I tried yet another software program that is designed to run on top of Windows Mobile software. But this time, the software is at the heart of a device designed by the same company: HTC Inc. I tested the HTC Touch Diamond, due out from Sprint (S) sometime this month for $250 (after a $100 mail-in rebate) with a two-year contract.

Taiwan-based HTC started out in 1998 as a maker and designer of mobile devices for other companies. A year ago, HTC launched the first device under its own name in the U.S., and now, Sprint, AT&T (T) and T-Mobile (DT) sell HTC-branded devices. The Diamond incorporates HTC software, as well as software from Sprint, MobiTV, TeleNav and others. But it isn’t a stretch to imagine HTC trying to create a fully end-to-end model (hardware and all software) in the future.

The Diamond has a touch screen, but it’s smaller than Apple’s (AAPL) iPhone — 2.8 versus 3.5 inches. This screen lacks the iPhone’s multitouch functionality, and its smaller size robs space used for touch gestures like flicking or scrolling with a finger. Yet like the iPhone, it relies solely on an on-screen keyboard for all text entries. Even with the Diamond’s stylus, the keyboard felt small and cramped. Using just your fingertips was next to impossible.

After using the Diamond for a week, I can say that despite its handsome TouchFLO 3D software and animated icons like photos that flip from one to the next with a flick of finger, this device failed to disguise the frustrating interface of Windows Mobile often enough for my taste.

It reminded me of the brown paper bag book covers my Dad helped me make for schoolbooks when I was a kid: They looked great on the outside, felt sturdy and clean and created a blank canvas for homemade doodles that were often more interesting to me than the books they covered. But my book covers couldn’t change what was underneath; pages of frustrating algebra were just a flip away.

HTC’s sleek software tries to hide Windows Mobile, but menus from the Microsoft operating system are constantly popping up. HTC’s email program, for example, is represented by an animated envelope icon that, when selected, cleverly flips twice before sliding an email message half-way out and giving you a three-line peek at what’s inside. If only reading and responding to email were half as entertaining. Selecting the animated envelope opens the old, cumbersome Windows Mobile email program.

Also, the touch capabilities of the Diamond’s screen didn’t work as well as they should. Finger flicks that should have scrolled through lists instead seemed to select individual items in a list, as if they were sticky.

The Diamond isn’t all bad, of course. Plenty of people will like its smaller size because the iPhone and RIM’s (RIM) BlackBerrys seem too large and brick-like to hold up to an ear for phone calls. Next to my BlackBerry Curve, the Diamond was of comparable thickness but measured smaller in width and length.

Despite its size, the Diamond is packed with features. It has a 3.2-megapixel camera with autofocus that doubles as a camcorder, and comes with four gigabytes of internal memory and a removable battery. I taped short videos — something the iPhone can’t do — and found the sound and video footage to be adequate.

HTC touts the Diamond’s browser, which is based on the Opera browsing engine but is designed for HTC. It opens Web pages in views that fit the screen and text is automatically resized as users zoom in or out, though this resizing was sometimes slow.

Unlike the iPhone, Web sites that are opened on the Diamond’s browser don’t resemble the actual site as you would see it on your computer. I opened CNN.com (TWX) and WSJ.com (NWS), two sites that are packed with text and graphics on a regular browser. On the Diamond, they quickly were rendered in list format with mostly text-only. I easily touched the screen to follow links to full stories.

Like the iPhone, the Diamond has an accelerometer, though it’s called the “G-Sensor.” When it worked, this feature flipped the screen to match the horizontal or vertical direction in which the device was being held. Photos flipped instantly, but the Diamond’s G-Sensor took almost three full seconds to respond as I flipped from vertical to horizontal while using the browser. And some Web sites didn’t respond to the G-Sensor flips at all.

A special YouTube application developed by HTC was easy to find on the device and worked quickly. My videos were organized into categories for All, History, Bookmarks and Search, though this last category required using the finger-fumbling keyboard. In one step, I emailed a link from a YouTube video to a friend using the device, with a still shot from the video included in the message.

Overall navigation on the Diamond isn’t as intuitive as on the iPhone or iPod Touch, nor was it as easy as on a touch-screen Windows Mobile device running the Kinoma Play application. The iPhone and iPod Touch use quick double-taps on touch screens to zoom in or out, and multitouch capabilities resize images with pinching gestures; Kinoma Play uses a long touch to zoom in. The Diamond used double tapping on some screens, but not enough for me to grow comfortably reliant on it. A small, circular pad beneath the device’s touch screen provided a more dependable method for zooming in or out of screens: tracing the perimeter of this circle clockwise with a finger zoomed in; counterclockwise zoomed out.

The HTC’s software animation is put to good use on its Weather screen. Here, animated illustrations of each day’s weather appear on the screen: suns spin, clouds move in, rain appears to fall. Even moons appear on the device at night to accurately reflect the weather in a city at a specific time.

It is exciting to think about other mobile-phone companies giving better software a real try, especially those that attempt to improve Windows Mobile. But HTC’s Touch Diamond doesn’t hide the outdated operating system well enough or often enough for a user to want to buy a whole new mobile device.

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