BookMooch - book swap

BookMooch lets you give away books you no longer need in exchange for books you really want. Every time you give someone a book, you earn a point and can get any book you want from anyone else at BookMooch. You receive a tenth of a point for every book you make available on BookMooch, and one point each time you give a book away. In order to keep receiving books, you need to give away at least one book for every three you receive. You receive three points when you send a book out of your country, to help compensate you for the greater mailing cost, but it only costs the moocher two points to get the book. Sounds a little complicated but in practice the process is very straightforward. The only minor downside is that it taps into the Amazon database and if your book is not listed on Amazon - and Amazon does sometimes manage to mess up bibliographic data - you can't add it to your BookMooch 'inventory'.