After reading a recent newspaper article, I joined LibraryThing.com:

http://www.librarything.com/

Just curious if any other Mudcatters are also members of LT.

For those unfamiliar with the site, it's a combination of a site for cataloguing your home library, and a booklovers' version of Mudcat. There's a very lively and active discussion section there.

Once you post a book, you can see which other users on the site have that book, and also look at their posted libraries, and likely find more books you'll be interested in yourself.

Lots of people are posing their music books along with everything else, and I've stumbled across some really interesting music collections, among other things.

Be careful, though - it's as addicting as Mudcat!