Shelfari.com is a great website. You can make your own shelf, full of books you have read, plan to read and want. You can also rate books and write reviews on them, look up your favorite author, and join groups for the books you love the most. It's a great place to help you keep track of what you're reading, meet new people, check out what your friends are reading and more.

Here is my profile for the site if you want to check it out:
http://www.shelfari.com/anonymously_dark