Of course, LibraryThing is even more useful if you post your book collection, and the process is wonderfully easy. (link)

LibraryThing is an impressive cataloging app that feels like del.icio.us

for books (link)

There are also suggestions of related books to read; it's a

virtual feast of information. All Things Considered

Many social connections thrive at the site. Although members can keep all details of their online catalog private, most choose to display their libraries... (link)

LibraryThing can also connect likeminded readers — a sort of MySpace for bookworms.

Now, with LibraryThing.com, we can peek at thousands of libraries.