Right, on the 18th of October, the guys from Sarcastic Gamer podcast and Gamertag Radio are running a charity event called Extra Life, which is basically a 24 hour gaming marathon. So really, you get people to sponsor you to game all day. There are make-up days if you can't make the 18th, like me, but if you are willing to participate at any time - I believe the money raised goes to a cancer charity - then go to
http://sarcasticgamer.com/forums/forumdisplay.php?f=51 for more information or make a fundraising sheet at
http://extralife.sarcasticgamer.com/