You might want to consider writing an article for Wikipedia. It could be an article about the topic of your book.
http://en.wikipedia.org/wiki/Main_Page - Start by doing a search from the home page and then you will be given an option to write an article. Make sure to work your book into your article and a link to your site.
Leads from Linda comes from Linda F. Radke of FiveStarPublications. Thanks, Linda!