We love LibraryThing. Those crazy wacky librarians and the stuff they think up.
We even bought the cool CueCat scanner so we can add our books just by scanning the UPC code on the back of the book.
So far we have gotten three our our friends to join the cult.
Naturally we have a lot of dog books. One we bought back in 1985 or so, used, for $5, is selling for $450 on eBay. Maybe we should sell it and buy dog toys or something.