Microsoft has released a new tool for PowerPoint: pptPlex. It allows you to zoom in and out of PowerPoint slides during a presentation.
I will experiment with it more over time, but an initial application that comes up already in my mind is to start designing a presentation around just 1 huge map, or time line, and take your audience through various sections of it over the course of a presentation.
Kawasaki's 10/20/30 rule suddenly becomes 1/30/6... (1 slide, 20 minutes, font 6).
An example video below:
Thank you TechCrunch for leading me to this.