I did Gamestop a few months ago when I upgraded to my PS3. Sold about 60-70 old PS2 games to them and they'll take anything (post Dreamcast) as long as the discs aren't too scratched, but don't expect a lot of money. Right now they have a deal where they'll give you 10-40% more for your old games in trade in credit - lasts until 12/06/09.