If you've stumbled across Swaptree online as I have it's a very interesting concept. The most popular Items seem to be Book's, Music, Videos, and Games. It seems easy to get started and all that is required in the website's suggestion's is to list 10 Items that you want and 10 Items that you have for Trade and let the Barter begin. Click on the link and experience the open market with some of those yardsale Item's that you've tucked away.