Shelfari is a social networking site for readers. Under the Books tab, you can find featured and popular books. Once you choose a book, Shelfari provides details about the books such as summaries, settings ,and characters. If the book is a part of a series, you can see the whole list of books. You can also see other people's reviews and recommendations.
LibraryThing a social networking site for book lovers. LibraryThing has lists of top books lists and book reviews and recommendations from members. If you have a book you like, you can search for it at the top of the page and find recommendations for similar books.
Goodreads is a place to keep track of the books you've read and share with others, and find recommendations for new books to read. Scroll toward the bottom for a good list of "best of" titles by genre, voted upon by fellow readers.