A) Living in America? (Or maybe Canada, they might take that too)
or
B ) Looking for a free copy of Grabbed by the Ghoulies, Star Fox Adventures, Banjo-Pilot, Donkey Kong Country (GBA), or Banjo-Kazooie: Grunty's Revenge?

If you would reply yes to both, I'd sign up for "Goozex.com", where you are given 100 trade points that are put towards the value of games people own and wish to trade to YOU for the aloted point value. The Rare games under "B" all are worth the 100 points they'll give you, so that's cool. If someone sends you Banjo-Pilot, they are rewarded with 100 trade points to use towards a game they want. I used it to get Lost Odyssey and Azurik, so you can be sure it's legit. After you get your free game, you can either walk away form Goozex forever, or pawn off the junk from your collection for something you want. I've just about traded all the rubbish I've bought over the years, and I expect the Xbox exclusive "Panzer Dragoon ORTA" in the mail this week. Hope it's good...
Right, there's my good deed for the month.
-Zenek