Imagine being able to put your entire library online so that people could check out what books you have (and you, in turn, could check out theirs). Library voyeurism... That's what LibraryThing is all about. Of course, if you're like me, you never get around to entering your entire book collection: you only dream of that magical day when all your books will be entered into LibraryThing and your electronic library will be neat and orderly -- unlike your real-world library, which is probably constantly outgrowing the real-world bookshelves in your real-world life. But it's a nice fantasy to carry around in your head if you're a book lover, like me.