What is a sidebar? You’ve seen them in magazines. A small box that juts out with additional information about the article you’re reading. Well, a PowerPoint slide can have a sidebar as well. A sidebar is meant to support and reinforce the main content of the slide. Laura Bergells is, among other things, a presentation coach. Laura points out that the presenter (the human) is the main content of the slide, and that the entire slide is actually a sidebar. However, sometimes content can be very dense and using the sidebar approach can help people break down the information into smaller, more easily digested pieces.
You can download a free sidebar template at Laura Bergells’s site: http://www.maniactive.com/states/2006/05/presentation-sidebar.html