I can think of lots of ways that could get used in music applications.
http://static.evernote.com/noteit.js 
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I can think of lots of ways that could get used in music applications.
http://static.evernote.com/noteit.js
Cool…Jean Michel Jarre style laser harp app needed here I think!
Just wait until the Ipad 2 is out with its shiny new camera, not only it will make that thing obsolete, but I can imagine plenty of applications which would make a creative use out of the camera.
Hand theremin anyone?
Its been done before with webcams and recently the Xbox Kinect, but I'm sure it could be done on a tablet with a camera.
I can see modulation control with this. Sort of a gesture-Kaoss type thing:)