Gamespy has got a most excellent write-up of games from the Independent Games Festival. Downloadable free games by the truckload that are actually good. Between this and green beer, your weekend has officially been shot to shit, hasn't it?
I don't have time for these games, cool as they seem, but I did break down and download Rumble Box on MAKE's suggestion and it does indeed kick ass. You're a shape golem that punches out other shape golems with the object being to climb over the broken pieces of your enemies to freedom. Which, honestly, sounds like every Needcoffee staff meeting we've ever had. Go here to Download.com to avoid having to login to Fileplanet.