I remember some of us signed up to swopster a while ago which was good while it lasted but i have found a new site which is a lot better. You have to pay a small amount for each swop but its a lot safer as it does not go straight to the person you are swoping with but to the site owners who wait before both games are in before sending them out. They also test them so you dont get a game that doesnt work.
Try it out as you get 1 free swop
http://www.gameshare.co.uk/
Try it out as you get 1 free swop
http://www.gameshare.co.uk/
perhaps ?