I discovered a company called Common Craft today. They use a mix of paper, drawings, and video to explain concepts "in plain English." The idea seems simple, but in fact, is rather difficult to do. As I explained elsewhere, distilling your expertise into a language that even a layman can understand is a daunting task, at best. However, the people at Common Craft do it exceptionally well. Here is an example which explains what Twitter is all about:
Simple explanations, visual support that enhances the information and captivates the audience, bite-sized and digestible quickly. That's what great information does. And you don't need PowerPoint!
If you're interested, I also have a Twitter account: http://twitter.com/lduperval.