Read your books, Sign them up on this websie then leave them somewhere to be found! you can track the book as it makes its way from reader to reader. Watch the site for updates in your area and hunt new books yourself!
I'm sorry this isn't particularly related, but there aren't many other popular spots that I could really fit a link into. x) But it's the spot for TIME magazine. :]
You can use Revish to keep and share a list of books you're reading, write reviews of books, find recommendations from other readers, and a whole lot more.