librarything

LibraryThing is a social web catalog for storing and sharing personal library catalogs and book lists. LibraryThing was developed by Tim Spalding in 2005. LibraryThings has attracted thousands of users from all over the world who have cataloged millions of books on different subjects: cook books, classics, science etc. The sign-up is free and a user can register upto 200 books. LibraryThing allows its users to catalog personal books, keep reading lists, and meet other users who have similar tastes in books.

Bookstores such as Amazon as well as some individual libraries volunteer cataloging infomation ( MARC and Dublin core records) for some of the books that are to be included in LibraryThing.