Bookhitch: Promote your book, and website for free.
The Writer's Life: A one stop directory of promotion links including links for author interviews, book review sites, websites to promote or announce your book and an event listing website.
Bookmouth: Blog with lots of advice and resources on how to promote your novel or writing work.
Getting a Buzz On: Article from the Book Standard on how publishers are turning online to market their books.
The Italian American Press: Promoting Self-Published Italian American Books, Sci-Fi Classics, First Editions, Rare and Old Books, Self-Help Paperbacks, Used Writing and Teaching Texts, Free E-Books, and Collectible Sheet Music.
Book Promotion: Good series of articles on promoting your book from Writers Write.