Check out this contest from Instructables. (If you haven't seen this site, check it out, also.)
Contest is currently OPEN! Enter yours or start voting now!
CONTEST STARTS:Apr 15, 2008
ENTRY DEADLINE:Jun 29, 2008
Instructables has teamed up with the folks at RoboGames to bring you the Robot Contest! Show them what you and your robots can do, and win a trip to go to RoboGames, flight and hotel room included!
(Contest Instructions and Official Rules)