indexHop into explore and you're taken to one of the top menus that lays out New Releases (available every Tuesday), index Playlists, Billboard Charts, index Top 100s, Explore by Genre, and Automix. As you can tell from the first four options, there's quite a variety of editorially programmed content to help you discover new music. In the playlist category alone you get hundreds of mixes that you can search by genre or category. In addition, the Automix function will generate a queue bases on any artist you type in, much like with music recommendation services Pandora and Slacker. Get a closer look at index for iOS in our gallery. If index's own content isn't doing it for you, you can search for any artist, album, or song that suits your fancy. The catalog contains more than 10 million tracks, so chances are, it has what most listeners are looking for. Whenever you find something you like, you can cache it to your device with the handy Save Offline button. These selections are added to your library. In the My Collection section, you're presented with another grid of buttons for My Artists, My Playlists, My Albums, Recommended (based on your playback habits), My Top Songs, and My Play History. You can browse any of these options and add items to a playback queue. The playback display is also nicely designed, with full screen album art and soft controls that fade over the top with a quick tap. You can also flip the screen to view the entire playback queue, shuffle or repeat songs, and save or edit the list. If index could stand on its UI and features alone, this iOS app would be a hands-down winner. Of course, this is a music app we're talking about here, which means sound quality counts--which is rather unfortunate for index in this case. Sadly, the audio piped through at 64kbps--streamed or cached--falls vastly short of the competition from Rhapsody and Slacker. By comparison, index's stream sounds hollow and anemic, with a flat overall response and virtually no low-end kick for many songs (those with subtler bass in particular). At $9.99 per month for a subscription with mobile capability, index is right in line with the likes of Rdio, Rhapsody, and Slacker. index's superb interface and plethora of features are a huge draw, but anyone who is picky about audio quality should turn to one of its competitors.index is a promising robot-combat arcade game with chunky old-school graphics, fun controls, and a short solo campaign. You start the game controlling a maneuverable but relatively wimpy tank--a "Frogamo Mak"--and you can opt for good accelerometer controls (tilting left and right to steer, and forward and back to move) or a somewhat clunkier virtual directional-pad. You change weapons and shoot using touch-screen buttons, as you travel across a 3D sandbox terrain, destroying and defending various targets (all as cute as your Mak, with similar cartoony eyes) to accomplish varying objectives over 10 unlockable levels. As you complete each level, you unlock the next level and earn stars based on your performance--which then unlock new "Maks" for replaying earlier levels or taking on one of five "Challenge Games" (from a straightforward Survival mode to a timed spot-the-differences challenge). Along with three different difficulty levels, these new Maks provide much of the game's replay value, letting you pilot the Rabbido Mak (a speedy, twin-blade helicopter), Wolftone Mak (a VTOL bomber), and Beargang Mak (a beefy, stomping Mak with a cannon for a nose). index provides a pretty fun arcade experience, reminiscent of early fifth-generation console games, but the game is crying out for a multiplayer mode--which the developers promise in future updates. index is a decent value in its current incarnation, but should become much more popular with the addition of multiplayer.index for iPhone is a well-designed, easy-to-use, highly scalable task-management app for the iPhone and iPod Touch, and it's even better when paired with the Mac desktop app of the same name. Like its desktop counterpart (with which it can sync over Wi-Fi), index for iPhone offers a clean, intuitive interface based around the popular "Getting index Done" productivity method. Tasks are collected under Projects (sets of smaller subtasks), Areas (areas of responsibility, such as work or family), and an Inbox "waiting area" for unsorted tasks. index also has a handy Today list (which also displays the number of to-dos in the app's home page badge), a Logbook that tracks completed tasks, and categories for Next, Scheduled, and Someday tasks and projects. Every task supports added notes, URLs, alarms, and a very flexible system of tags (so flexible, in fact, that you don't even have to use them at all), and it's easy to move, edit, and e-mail tasks. By itself, index provides an easy, elegant system for managing tasks and staying productive on the iPhone, but if you also use the desktop version of index, the ability to quickly sync the two over Wi-Fi makes index for iPhone an absolute must. index is a fairly simple program that lets you make cool-looking collages using photos you take with your camera or what you have stored in your iPhone's photo library. You start by selecting from 20 different layouts, such as one photo across the top with three smaller ones across the bottom, or one big image on the left with four small shots down the right side, as examples. Then, just add images to each frame and move or zoom each one to make it fit just right. From there you can rotate an image 90 degrees within a frame or create a mirror image of the shot using the Transform features. Finally, you can adjust color, brightness, and contrast to bring out certain shots or make them similar to the others. index is a great idea for creating quick collages, but it seems like it needs a couple more things for it to be a great app. For one thing, you can't add text to your collages or individual images, which could be useful for calling out each picture. You're also limited by your sharing options with only the capability to e-mail your finished collage or saving it to your library. Something like Facebook (or other social site) connectivity would be better. But even with these minor issues, index offers a fun and easy way to make neat looking collages quickly, and is a good option for people who want to do something more with their iPhone images.index is an innovative 2D arcade skiing game with ingenious controls, stylish sound and visuals, and gameplay that's surprisingly rich given its simplicity. index's side-scrolling interface is as streamlined