I've had my eye on Sound Shapes for a good long while; the music-platformer-sequencer isn't quite like any game I've played before, and I'm entirely enamored of its approach to musically integrated level design.
In this video, Queasy Games' Jonathan Mak puts together a track using the built-in level editor. As you can see, it's sort of LittleBigPlanet by way of, well, a music sequencer. Looking forward to playing this one. More info on the game is available in a post on the PlayStation Blog.