Story on NPR about Book Social Networking

I heard a great story on NPR this afternoon about a variety of book social networks on the web. The one that was of particular interest to me was www.Librarything.com. This site allows you to list all of the books in your library, or those that you have read. It then will match you up with other readers with "eerily" similar interests. Sounds like fun, I am definitely going to sign up! I will add a link to my library on my blog as soon as I complete it.