Paperbackswap.com

If you're an avid reader, this website is the place for you. It's a book trading depot where you earn credits by mailing your books to others across the country. Every time you mail a book, you get a credit that enables you to "buy" a book from someone else. I've been on the site for about 2 years, and I've only had a couple of problems in all that time. One was that someone sent me the wrong book and then never credited me back for it. And the other was that the site administrator did not like me "advertising" my blog at the bottom of my posts on their blog. Oh well. I've saved a lot of money in book-buying, though, and that's the main benefit! Enjoy your swapping!