For someone who has already done some public speaking and presentation, this will serve as an excellent book that helps the speaker build confidence by focussing on a single member of the audience. It's such a simple and helpful technique that many of us who have been speaking publicly for years may be surprised why we didn't know it.
Further to this, the author also offers a lot of tips on attire, eye contact, pitch, gestures, pauses, microphone issues and so on. I strongly recommend any public speaker to buy and keep a copy of this book for reference before any presentation.
Very valuable reference for the sesoned public speaker or someone with a bit of experience, but for those still struggling with stage fright, it won't help that much.