Blueprint - an awesome online game!
It's so awesome, me and my brother were playing last night. We got to level 8 or something like that and we almost beat the last level. it was really cool. You should try playing it, and post here if you beat it or get on the high score list or anything. And discuss the other games on that site here as well. Blueprint and Chuck are probably my two favorites (though I've only played about 1/2 of them so far).