This isn't a technical guide, but provides an outstanding analysis on how use PowerPoint to it's fullest. Don't put the kids or staff to sleep. Make them think, make it interactive. (Thank you Dr. Barbara Chamberlin, New Mexico State University)
Avoiding the PowerPoint penalty: Guidelines for meaningful use in pre-service education (PDF)
Given at SITE, 2003 (Albuquerque, NM) Society for Information Technology and Teacher Education
The PowerPoint presentation below is from the IASTED.org website. In one presentation, it shows the good, the bad and the ugly of PowerPoint presentations.
If you are trying to show a class what NOT to do, I recommend this example. This
http://www.iasted.org/conferences/formatting/Presentations-Tips.ppt#256,1,Making PowerPoint Slides
Make videos, story books, artwork and more. Free teacher accounts let you keep track of your students. They even have lesson plans to help you out.
Cost: Free