Code4Libers may be interested in something I just released on LibraryThing. It's called "CoverGuess," and it's a sort of like Google Labeler for book covers. It turns tagging covers into a competitive game. As with much of what we do, the data will be released as Creative Commons Attribution Non-Commercial. So, with luck and a lot of LibraryThing community involvement, we may finally have a solution for the eternal question: "Have you got that book, the one that's blue and I think it has a girl on it?" Blog post: http://www.librarything.com/blog/2010/03/coverguess-game-that-helps-people-find.php Tim -- Check out my library at http://www.librarything.com/profile/timspalding