ROBOT magazine is supposed to be posting building instructions shortly for the bot I submitted for the Fall 2006 issue - keep checking here if you want to build one.
This one was done for fun... just to see how many parts I could throw at it from the retail kit... I ran out of most of the beams, all of the little black connectors, and all the Hassenpins and those similar-looking grey pins. I also was asked to use all the motors and sensors...
My wife didn't like it because it looked "creepy" (her words)... if it weren't so loud, I'd put it under the bed or couch and have it grab her ankle (of course, then I'd be sleeping on that couch).