The Kaoss Pad really is a fun controller. I played with one myself back at Winter NAMM in Anaheim.

Check it out on YouTube http://uk.youtube.com/watch?v=owkeBOcC-AQ

And there are lot more videos there showing uses of the Kaoss Pad.
http://uk.youtube.com/results?search_query=kaoss+pad&search_type=&aq=f