Goodreads ... launched in 2007 Goodreads has become the world’s largest site for readers and book recommendations. Just add all the books you own, have read, plan to read, write reviews, browse lists, answer trivia questions, participate in reading challenges, chat in groups, and if there's time left, read the book you were lucky enough to win in the First Reads giveaways.
Don't classify me, read me. I'm a writer, not a genre.
LibraryThing ... created in 2006 LibraryThing is yet another online service to help people catalog their books easily. It's about quality cataloging, book-geekery, and of course, libraries. Available in more than half a dozen languages, with unique features such as book haikus and legacy libraries, all wrapped in the trademark "dead salmon color".