I've been looking for materials and information you could use to teach skepticism.

First, a brilliant documentary: An episode of Frontline from 1993 called Prisoners of Silence (click for a summary; from there, follow a link to a complete transcript). About "Facilitated Communication," a method that was believed (and is still believed by some) to enable severely autistic people to communicate, but which was shown to be bogus in a devastatingly simple experiment. It sympathetically shows how well-intentioned people can manage to fool themselves.

Some organizations and publications:

'Skeptic' magazine and the Skeptics Society

'Skeptical Inquirer' magazine and the Committee for the Scientific Investigation of Claims of the Paranormal

James Randi Educational Foundation

Quackwatch (but I see this has been posted before)

Bob McCoy and the Museum of Questionable Medical Devices - right here in Minnesota! This one is a lot of fun. The sheer number and variety of devices and theories is amazing.

(It's been fun, and I'd love to find more, but I've got to get to bed!)