Try using traffic exchange programs to promote your website or blog, if you have a book that you're trying to sell. Traffic exchanges are basically free traffic driven to your site. The stipulation here is that you must also surf other's sites to get credits, which in turn puts your site into their rotation and other people must visit your site. This is a free way to get some traffic to your site or blog that requires only your time, not your money. Most of the programs have a paid service too, if you just can't spare the time to do the surfing.
Here are some good ones:
hitpulse.com
trafficg.com
ts25.com & webbizinsider.com
I know this can help some of you in your promotional efforts. People with all types of products and services are using these programs. But you do have to put in the surf time to see real benefits.