I've discovered an interesting website called LibraryThing (www.librarything.com) that lets you catalogue your private book collection and lets you use tags to organize them. It's as easy as typing in a book title and then searching Amazon.com, the Library of Congress or sixty other world libraries. Once you find and choose the edition you want, LibraryThing dumps the cataloguing info into the record.
You can share your catalogue with other book lovers and browse their collections. Users can post reviews and get recommendations from other members. You can also join or create discussion groups. The website connects people based on the books they read and share.
LibraryThing is a free service for the first 200 books catalogued. Anything over that number incurs a quite reasonable fee of $10 annually or $25 for a lifetime membership.
