To get a large group of people to evangelize about your product or service is the end goal of any marketing campaign, and it’s something that my friend Dave Balter knows a lot about. In 2002, Dave founded BzzAgent, a word of mouth media company that currently coordinates 450,000 volunteer “agents” in the US, Canada, and the U.K.. Dave recently wrote and self-published his second book on Word of Mouth marketing, creatively titled “The Word of Mouth Manual Volume II.” It’s a great read, illustrated with examples from the Grateful Dead, Crocs, and of course, Apple. The book is for sale for $45 on Amazon, but Dave’s provided the book to a few folks for free, as a PDF download, available here. If you’ve ever been curious about how or why word of mouth marketing works, or how to get folks to start talking about your own product, I recommend you check it out.