Well, almost! I've recently discovered 'Bookmooch' (
www.bookmooch.com) which is a sort of online book-swap. Basically, you list books you no longer want, then if someone else wants one of your books, you post it to them at your own expense. Equally, you can request books from other people, and they'll send to you at their expense. It works on a points system - you get points for books you list and books you send, and you can 'spend' points on books you'd like to own. You can also set up a 'wishlist', and they'll elt you know when the book you want becomes available.
I think it's a brilliant idea, and I want everyone else to know about it!