Influence: The Psychology of Persuasion by Robert B. Cialdini, Ph.D. is a fantastic book. I just finished reading it, and if you have not read it yet, get it, and read it! It is powerful stuff!
I just completed my Competent Communicator Award with Toastmasters and I will be working on two advanced manuals. My speech ideas will be coming from this book to help me solidify my learning from this wise professor.
Contact me if you want to talk about this book, or anything else that will help you build Freedom, Power and Joy in your life!