Planetary isn’t the most practical iPad app, but it’s absolutely one of the prettiest. The app reads your iTunes collection, then forms a gorgeous miniature galaxy — complete with elegantly animated solar flares — on your iPad, where the suns, orbiting planets and moons all represent artists, albums and songs respectively.
You can zoom out to the galaxy view to see your entire collection spin as you set the galaxy in motion, then seamlessly zoom in to the planetary level with a touch, and watch albums and individual songs revolve around their parent bodies.
It’s not the easiest tool to navigate with: sorting options are slim and star systems aren’t visually depicted in a logical way that makes sense to me (do brighter stars have more plays, more albums or higher ratings? Doesn’t look that way); but it’s free, it’s cool, and it’s pretty. And this is apparently just an appetizer, as developer Bloom Studio says they’ll be applying this concept to other relationships, like social networks and location-based apps. Super cool.