Cooler than wheresgeorge.com, memepool pointed me to bookcrossing.com.
The \"3 Rs\" of BookCrossing.com, Read a good book, Register it, then Release it for someone else to read. tregoweth does it again!
\"You know the feeling you get after reading a book that speaks to you, that touches your life, a feeling that you want to share it with someone else? BookCrossing.com gives you a simple way to share your books with the world, and follow their paths forever more.\"