I have read a lot of really excellent social media-related books lately. I personally enjoyed reading David Seaman’s book: Dirty Little Secrets of Buzz. It had some excellent advice about how to market you or your products and it is written in a way that is entertaining and doesn’t pull any punches. He lists some great resources and excellent ideas about how to advertise and not spend a lot doing it. I was aware of some of what he wrote but he added a lot of new twists to explain how to use some of the sites you might already be familiar with to help drive traffic to your site. . . I highly recommend it.