I remember Guy Kawasaki from the early days of Macintosh and his book, "The Macintosh Way." He worked with Steve Jobs twice (one of the few who managed to do that). In this video, he has some insights that he learned from Steve Jobs. There are some great ideas in there, like, in a presentation, the point size of your smallest font should be approximately half the age of the oldest person in your audience. Definitely inspirational and worth 20 minutes of your time, but if you prefer, you can read essentially the same thing here.