I honestly think SwapTree is one of the best things I've ever discovered on the internet. It is a book/music/dvd trading site that is actually easy to use! There is no charge and, out of my four trades, I have never been let down! This week I shipped out my Vanessa Hudgens cd (which I am very embarrassed to have owned) and am receiving the book Post Secrets by Frank Warren. They website finds all the trades for you, based on the the items you want, and your user ratings. They've recently added a new feature that lets you do three way trades.