I took a training class today and the instructor was one of those people who thinks with a pen in his hand. I don’t think he’s capable of stopping himself from circling things on flipcharts, whiteboards, handouts, or anything else inanimate. I had a great time watching him think.
If there is a presenter anywhere in the world that needs a Tablet PC, it is this guy! Take a look at one of the cleaner flipcharts…

At least he did it on paper and not the wall. Though I’ve seen powerpoint slides (with animation) that are that bad and worse. Did you learn anything?