This is the greatest idea! I love paperback swap! It's a simple concept. You join - you get 2 free book credits - you request a book - you get it sent to you FREE - you list books on the site by posting the ISBN # - someone requests your books - you send them out and pay postage... the cycle continues!:-) Overall, you are only paying $3-$4 a book, so if you are a bookworm, this is perfect.