19. Take a look at LibraryThing and catalog some of your favorite books.

This was my first introduction to LibraryThing.com, which is a book lover's dream.  It reminds me slightly of the Interenet Movie Database, but for books of course.  You can search by title, author, or keywords.  You can connect with others whom have added the same books to their online"virtual bookshelf."  You also can read and post reviews of the books.

Everyones Favorite.