http://www.playerchain.com/
It's a website where you trade games with other people, seems really cool to me.
With PlayerChain you can trade as many games as you want from the comfort of your home and have them delivered right to your door! When you’re ready to trade games, simply post them in our database. When you accept a member’s request for your game, you receive the asking price in Game Bucks. You can use your newly acquired Game Bucks towards any item in our database. Trading is fast and convenient and there is no limit to how many trades you can make. Use our auction system to make requests to multiple members for the same item. The first member to accept the offer wins and the game is on its way. There are no late fees because you own all the games you receive. Plus, because our business model doesn’t stand to make a profit off the value of your game, you can receive the full market value.