I see client PowerPoints from time to time and they often have two primary characteristics: one, they’ve managed to squeeze more words, charts and images in a slide than I would have thought humanly possible (think college students of the 1950s squeezing into a Volkswagen) and two, they reprise a lot of the content contained in their websites and sales collateral. Big mistakes. Guy Kawasaki, a venture capitalist and entrepreneur, posted The 10/20/30 Rule of PowerPoint a few years ago… and if his rule isn’t as immutable as...