I've tried a few video game trading sites, but never stuck with any of them. This one doesn't look familiar -- maybe I'll give it a try.
I usually just trade games in a LiveJournal group (IF I decide that I have any games to trade. I usually keep all of my games).
:EDIT: I just made an account. It's too bad I didn't find out about this BEFORE I sold a bunch of games to my local game store. Oh well, I got an okay deal on them. This does look like the kind of site I've been looking for -- something that is similar to paperbackswap.com.