I have just swapped how I tracked the books I read from AllConsuming to GoodReads.
Why?
GoodReads is cleaner, neater, outputs an rss, has a facebook application, allows for reviews, ratings, sharing, the search works better, is still possible to dump in the sidebar of the blog, has the option to add books to your ‘to read’ list and output in various view formats. Plus there’s endless book trivia if you’re really bored and have worn out all your usual facebook tricks.