If you want to ace presentations, you need to get familiar with the work of Edward Tufte, Professor Emeritus at Yale University, where he taught courses in statistical evidence, information design, and interface design. The New York Times called him “The Leonardo da Vinci of data.” He has written numerous books on information design, including his new book Beautiful Evidence. I just received a brochure about his upcoming one-day courses "Presenting Data and Information." It may be a good investment in the development of my spatial intelligence. Edward Tufte’s website also has a moderated forum, Ask E.T., where he answers questions and leads discussions dealing with information design. Check out the Grand truths about human behavior or Advice for effective analytical reasoning for some thought-provoking commentary.