Book Listing Sites

I found a new book listing site today: Revish.  An strange name, I have no idea what it means. Anyway I added the site to the two other book listing sites I belong to: Library Thing and Good Reads. They are all good sites. I think Library Thing has the most information in it, and Revish seems to have the nicest layout and user interface. Anyone else out there know any other book listing sites ? What is your favorite book site ?