Richard Hill has published a short, 12 page, guide about how to add DNA testing to your genealogical research tool kit. You can download it free from his website:
Dick has developed a great site, DNA Testing Adviser. This site provides rich and authoritative information about DNA testing and adoption searches--the twin passions of Dick's life. His own quest to find his biological parents, using DNA testing and traditional search tools, was documented on the first page of the Wall Street Journal.