My latest, an ADB trackpad in an extended extended ADB keyboard with painted everything to hide the Frankensteining and relabeled keys.
A writeup will show up sometime after I get the contruction photos back - probably next week since I haven't dropped the film off for development yet (yes, I'm too cheap/picky to get a good digital camera)
Cool, Ive always liked trackballs over a mouse, and putting it in the keyboard is awesome!! (my desk is soo messy with all my macs and cables)