The unexamined life is not worth living.
Slide shows are still better than video, or computer presentations, for large audiences.
The vivid colors, and sharp details of a good 35 mm slide put even the best video or computer image to shame. Point and shoot cameras have improved in quality and ease of use. I use my Yashica T4 for most of my technical climbing, saving my Olympus system for non-technical work. Snaping a few still shots is much quicker and easier than shooting video. The mark of a successful presentation comes when the last slide fades, the lights come on, and the audience still wants more.