Came across this page in doing some research about marketing.
I thought you might find it interesting, too. :)

Top 101 Book Marketing Sites

(from the website)
This page features top sites of interest to book publishers, authors, and self-publishers.
Lots of book marketing tools and resources are featured here.

Note: This is a personal list, based on the judgment of John Kremer. If you'd like to nominate an appropriate website, please email John Kremer. I know that I have missed some companies I truly would like to add to this list. Your company might be one of those. - book marketing expert John Kremer, author of 1001 Ways to Market Your Books

Acses Book Price Search Engine - This service allows consumers to compare prices from over 20 online bookstores! A good place to see what your books are selling for (after discounts and postage) at the major web booksellers. Note that this service makes its money by joining the associate sales programs of all the featured booksellers.

All Books Free - A site for sharing ebook versions of your novels, short stories, and children's books. All books are freely available for anyone to download and read. Alexa rank: 1,674,010 in October 2010.

Any New Books?, Antonio Cangiano, Founder. Email: info@anynewbooks.com. - Features notifications to users of new books in various subject categories. They have a simple editorial policy: With the exception of areas that will be clearly marked as advertisements, all the content of our newsletter has been selected and curated by us, not by our advertisers/sponsors. This assures you that a book will appear solely in a weekly email on the grounds that it’s interesting and new, not because of some behind the scenes deal with a publishing company.

AuthorBuzz - Email: authorbuzzco@aol.com. Puts authors in touch with 365,000 readers, 12,000 librarians, 5,000 booksellers, and 14,800 leaders of bookclubs.

There's alot more in this list and hopefully it'll come in handy for you.
Read more here:
http://www.bookmarket.com/101bm.htm

Interesting article from Publishing Push. It's worth a read.
Here's a little snippet to get you going. You can read the full article by clicking the link below.

Book Marketing – What 200+ campaigns has taught us.

A good writer should bleed. Not literally but figuratively. People connect with honesty where the writer is a little vulnerable. We have given this advice on many occasions and now we shall implement it ourselves. We have been running book marketing campaigns for years. Over 200+ campaigns.

We’ve worked with self-published authors, major publishing houses, brand new authors and established best selling authors. What follows is what we’ve learned about book marketing. We have decided to bare all. Both the ups and the downs. This post will not remain static. It will be updated and refined as we continue our work.
run

source technologytherapy.com

Book Marketing Is A Marathon Not A Sprint

The title above makes me feel like a management consultant. So let me rephrase my point more eloquently. The best time to start planning your book marketing strategy is before your book is ready. Start to build your platform. You may have heard the term platform recently, coming from publishing houses, agents and marketing professionals. A platform translates to visibility and a way to reach your audience reliably and regularly. A specific example would be a great blog, that receives excellent engagement and has a strong email subscriber list. Or you could focus on cultivating a highly engaged social media following.

More here: http://publishingpush.com/blog/book-marketing/