PaperBackSwap.com was designed to allow readers to "swap" their books.  After you sign up, you'll be given the opportunity to list books you no longer want to read.  Once uploaded into the system, other PBS'ers have the opportunity to request one of your books.  It's a simple as that.

The only costs involved are shipping.  Each time you ship a book, you get a credit.  Use your credits to "swap" with other members.  If you find or request a book you want, they will then ship it to you.  It's easy, fun and a great way to keep you personal library fresh!