The thing about writing as few words as possible on the slide isn't unique to Jobs. I've been teaching that to my students for 20 years or more. I got it from a book( well, more like a booklet. it is really thin with tons of pictures) called Save Our Slides.
I remember sitting in a short session at a small UK university, about presenting, in 2002. The main message was to keep the audience's attention on you, not the screen. In many ways it was stating the obvious, but it's true that few people ever stop and reason about these things.
To this day, the few tips I picked up in that silly little session still make me a much better presenter and slide-maker than 99% of my colleagues, hands down, and I'm really not bragging.
that's something I learned at university, though I don't remember if it was explicitly told in class or something I picked up when preparing presentations
