Planetary: Planetary is an iPad-only music player that renders your collection as a stunning universe of stars (artist), planets (albums), and moons (songs). Each successive level is fluidly interactive: tap on the name of a song to play it, give the display a gentle nudge to set the solar system spinning in motion, and expand with two fingers to zoom out back to album view. It's hard to explain the experience in words, but it's just one of those brilliantly designed apps that responds to your every touch just the way you think it should. Free.
Adobe Eazel for Photoshop: Adobe Eazel, Jesus' favorite iPad Photoshop app, works as a standalone paint application and also connects to Photoshop, sending images that get automagically scaled to whatever resolution you want. What's especially cool is the five finger interface and the mixing of wet and dry paint for color blending, with an engine that allows paint to dry over time, just like in real life. $5