Presentation Zen, by Garr Reynolds is one of the best books I've ever read on the subject of Presentation Design and Delivery. It will teach you how to take a program as simple as Power Point and build a production that stands out and is memorable. If you do any speaking anywhere, this is a book you should read! It will help you look more professional and it will set you apart from any of the other sharpeners in your area.
Image: Bobby Huffman speaking at one of the Wolff/Huff Shows