Some ideas:
If your book is available in Kindle format, post an introduction for the book at the Book Bazaar on the Kindle Boards
http://www.kindleboards.com/index.php/board,42.0.html
Read this thread:
http://www.kindleboards.com/index.ph...html#msg660219
and follow its instructions
Post an introduction for the book at
https://www.mobileread.com/forums/ in the self-promo area.
If you've made your book available for the Nook and other readers via Smashwords, post an intro for the book at
http://www.nookboards.com/forum/ too.
Join Goodreads.com and become a Goodreads author. Join some groups that focus on the type of book you wrote. Introduce yourself in the intro topic, then see if they allow authors to create a promo thread.
If you have a print copy of your book, consider hosting a giveaway at Goodreads. That's a great way to get 1000 or so people to take a look at your blurb!
Join LibraryThing and become a LT Author. Consider hosting a giveaway in exchange for reviews. They'll let you giveaway ebooks.
Seek out bloggers who blog about the kind of book you've written, and ask for a review. You'll need to be able to send them a free copy of your book. Some don't review self-published authors, and some don't review ebooks, so you'll need to research them a little.
Encourage those who've read your book to write a review. Doesn't have to be a long essay -- just a couple sentences on why they liked it and/or recommend it. Word of mouth is the best marketing tool ever, and reviews are one form of that. Never ever write reviews yourself (yes, some writers have done that!), and try to discourage relatives from posting reviews unless they happen to review other books as a general rule.
If you book is available for the Kindle, consider a sponsorship at Kindle Nation Daily. It costs money, but it'll give you some great exposure (and maybe some sales, too).
Consider signing up for the Kindle Boards Book of the Day. There's a sign-up widget at the bottom of the Kindle Boards > Kindle Boards Community Center > The Book Bazaar > Writers' Cafe
Participate in forums that discuss books & reading, but don't promo there unless it's explicitly permitted (you might get banned). Do put a link to your book in your sig. When you show up regularly, people will get curious and click.
Create a fan page for the book at Facebook. If you don't already have a facebook account, create one for your author persona.
If your Amazon name is something like, "K.C. May, author," readers might check out your book after reading reviews you've written about other books. Review the books you really like, especially if they're in your genre. (But don't use reviews of other books to promote your own book!)
Sign up at
http://www.authorsden.com/ and explore!
If you have a blog, you can feed it to Amazon so that people who click your author's profile will see your blog posts.
Write up a press release and send it to your local newspaper. People love having an author in their community.
Consider joining twitter in order to make announcements ("new 5-star review!") and connect with other authors, readers, etc.
Announce good reviews everywhere -- nookboards, mobileread, goodreads, blog, facebook, etc. Use words in your facebook announcements that will "feed" into related groups. For example, I always use "epic fantasy" in my announcements so that the Epic fantasy group will get them. You can post to Amazon Kindle's wall once per week per book.
Some folks have created book trailers and posted to Youtube. You can also post them on your amazon book's page if you sign up for authorcentral.amazon.com (or authorcentral.amazon.co.uk). It might be more trouble than it's worth; many people admit they don't watch book trailers. However, one author I know posted a video of himself doing a reading, and that's apparently been helping his sales.