Found this interesting service that allows you to catalog your books online. Then based on the books in your library it connects people with the same books and comes up with suggestions for what to read next. It gives you the ability to include your books in your blog, and create feeds etc.
The only downside is that its free service only allows you to catalog upto 200 books, to catalog more books you need to pay a $10 for a year price.
Check it out :LibraryThing
– Suramya