I like this much better than the post it's a sequel to. It is clear, to the point, readable in one minute. One point I would add is "Don't make your audience wait." People who commit the crime of bullet points often aggravate it by making them appear (or slide in with a whoosh effect) one at a time, forcing the audience to process the information much slower than they could. It's very frustrating for the audience. The screen blanking tip is useful (and underdocumented). The best slideshows I've seen had the screen blank most of the time, and were used to show photos and diagrams as necessary, containing no text.