Wayne Coyne of The Flaming Lips built himself a pretty awesome guitar. It's a double-neck SG with a regular six-string on top. The second neck is a Guitar Hero controller connected to a Kaoscillator, which is, in essence, a noisemaker. Nifty. Gregg Gillis should make one of these that just controls the tracks on his laptop.
Watch the video—guitar stuff starts around 2:00.
(Terrorist fist jab: Catbirdseat.)