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I would like to acknowledge all of the readers who have provided me with such valuable feedback on my previous books. From the critiques to the laudations, they have all added to my knowledge of the writing and teaching process. In addition, I want to thank the excellent staff at McGraw-Hill and Shan Nichols, who was a very patient technical editor. Shan, you definitely increased the quality of the technical material in this book. Finally, I want to acknowledge yet another person from history who has influenced my life: Dwight L. Moody. Dwight L. Moody was a powerful man with a vision that gave him purpose and energy. He was an example of hard work and discipline that influences me daily. For that, and the many great books by great authors....