I want one of these badly. This is the 8 x 16 monome. Check out the guitar sound.
http://www.youtube.com/watch?v=F0A8xR8ieek&feature=related
Here\'s a simpler 8x8 model.
http://www.youtube.com/watch?v=1YVzTpkLco0&feature=related
Not only does it sound cool, it looks cool too.