I just discovered shelfari.com
It is a place to keep all your book information, like which books have you read, which do you like.
It's really slick and looks nice.
Here's my entry:
http://www.shelfari.com/khebbie
By the way I even added a widget to this blog, where you can see my books. I got the widget from http://www.dscoduc.com/post/2008/08/01/Shelfari-Widget-for-BlogEngineNET.aspx