Keeping up with your reading lists

So, my friend Josh just turned me on to this site called Good Reads. Basically it's a way to list/rate all the books you've ever read, are reading, or someday want to read. The fun, of course, is getting all your friends to do it, too, so you can see what they recommend. If nothing else, it's definitely a good way to waste some time at work as you mentally imagine all your bookshelves at home. :)