Blog on Amazon!
Amazon has created a special program called AmazonConnect that gives authors the opportunity to post messages to their readers directly on the site.
Evidence shows that authors who blog here sell more books there than authors who don’t. (Note that the Amazon blog doesn’t have to be a huge time commitment; one posting every month or so is fine.) If you already have a blog, you can link it directly to Amazon.
One added bonus is that the content you post to Amazon doesn’t have to be exclusive to Amazon. If you already have a blog, you can hook up an RSS feed so that your posts to your blog feed into Amazon. You get double the exposure this way!