I put up a review of some online game trading sites on AdultGamingEnthusiats.com ... check it out:

Do you have a bunch of old games you want to sell/trade? Gamestop/EB is always an option, but we all know they have some pretty crappy trade in prices. You could always try one of the many online game trading sites. But, which one is best? See this review to get a better idea of what to expect from these online game trading services....

http://adultgamingenthusiasts.com/blogs/age/archive/2007/01/18/review-of-online-game-trading-sites-goozex-sayswap-gametz.aspx