Here's a great site - Bookcrossing

This site, bookcrossing, is very interesting and anybody who is a book reader will appreciate what it is there for. When you read a book, enjoy it and think other people will also enjoy it, you can register it on the site and then leave the book anywhere where it can be found - on a park seat, the bus or train, coffee shop or wherever you like. Someone will pick it up, read it and do the same as you did. In theory, books can travel around the world being enjoyed! An interesting concept giving pleasure to lots of readers and satisfaction to yourself. Try it out at http://www.bookcrossing.com/.