Read the whole article I know this raises privacy issues, but it does sound interesting. For one, it would finally solve my problem when giving people books: what is to their taste, and what do they already have?
I'm a member! Alas, my wife and I are not quite halfway through the cataloging process, but we're having a blast. Come visit us, if you like: http://www.librarything.com/profile/JohnAdcoxCarolBales