"Thing 11: Take a look at LibraryThing and catalog some of your favorite books."

My LibraryThing catalog is here: http://www.librarything.com/home/rleb .

LibraryThing is an easy way to create your own unique, customized catalog. When adding a title, I browsed through other related titles and ended up finding other interesting books. It was also helpful to see other suggested tags when you aren't using the traditional Library of Congress or Dewey classification.

I also like the ability to view and share catalogs/titles, author promotions and offered free titles.
LibraryThing is also called "MySpace for books" and "Facebook for books." It is an interesting site to explore.