Pluto Pluto for the iPhone and iPod Touch Video Review
Pluto Pluto is a sound game/toy allowing you to create different beats by moving two (or three) balls on screen. As the balls bounce off of each other and the edges of the screen they create beats that can be saved into one of four presets. You can then play back those beats while creating more. Unfortunately, there's no way to export your creations, and frankly you might not even want to as you don't have as much control over the music in Pluto Pluto as in say something like Bebot.
Add some more options, and make it more of a full-fledged music creation tool and we'd be more interested. For now, you can probably pass on Pluto Pluto.
Here's a look: