The Game Trading Zone is a new site dedicated to the swapping of computer and video games. You simply set up a free account, list the titles you have to swap and the titles you want, and a matching process will show you who to contact.
It’s well set up, legitimate (i.e. no copies, backups etc, only originals) and seems to have a good chance of becoming a mini e-bay for game swapping. It seems to be advertising supported (users can subscribe to remove the ads and popups) which may make it a vulnerable business in the short term, however I like the concept a lot, and hope that it takes off in a big way.