Here's a free video resource on critical thinking that one can watch online or download for free non-commercial use through a Creative Commons license. In addition to YouTube and Google Video format, you can download the movie in various video formats and in .iso image files for burning your own DVDs.
Here's the description from the movie's web site:
Here Be Dragons is a free 40 minute video introduction to critical thinking. It is suitable for general audiences and is licensed for free distribution and public display.
Most people fully accept paranormal and pseudoscientific claims without critique as they are promoted by the mass media. Here Be Dragons offers a toolbox for recognizing and understanding the dangers of pseudoscience, and appreciation for the reality-based benefits offered by real science.
Here Be Dragons is written and presented by Brian Dunning, host and producer of the Skeptoid podcast, author of Skeptoid: Critical Analysis of Pop Phenomena, and Executive Producer of The Skeptologists.