I signed up and entered ratings for 41 books. At that point, I lost the will to live with the user interface they have (4 clicks to rate a book! multiple pages for an author search!) and I don't think I'll be back....
@MATT KATZ I agree with you completely. I would love to see a federated system, that allowed me to review books on my own site, and keep track of a list other reviewers I'm interested in, independent of anyone's walled garden. An open format (an extension of hReview?) for book reviews would be nice to. Allowing any site (Amazon, LibraryThing, BookArmy, etc.) to pull in Creative-Commons-licensed reviews based on ISBN. @NOLLY I think you missed the point. It's not about features. It's about open data....
I personally really like Goodreads, which somebody else mentioned above me. You can search for authors you like and the system will recommend you other books. There are also tons of book groups and interesting people to friend. I love knowing what other people are reading! Plus, it's great for making library lists and keeping track of which series I've read or where in a series I stopped. You can arrange your books into shelves with tags and assign a status like to-read or read. It's a godsend for people like me who can read five or six books a...