Trading in your old books for new ones!

I found this randomly on the net and I think its a really neat idea :

List all your old paperback books and you recieve credits for the books you ship to other people. Once you get credits you can turn those in toward getting all new books! Seeing as I'm a book junkie I am super excited about this site. I think I will use my first credits to get Connor some of the books on our wishlist!

Now I need to go dig out my books from the storage room and start listing away!