ScreencastingReview this screencast about Wikipedia by John Udell recommended in your book. This screencast explains how Wikipedia articles evolve and is a great example of how to teach a concept using screencasts.
The EDUCAUSE article 7 Things You Should Know About Screencasting (PDF) is a quick overview of screencasts and their uses in education. John Udell's Screencasting tips provide suggestions for using screencasts effectively.