James Randi -- conjourer, critical thinker, skeptic, and friend -- did a series of great interviews on Big Think. Here's one where he talks about spending his life attacking antiscience and its purveyors, specifically Uri Geller and Sylvia Browne.
The interviews are all short, just a few minutes long, and you can access all of them on the Big Think site. It's well worth your time to hear from this giant of skepticism.
Bonus: the James Randi Educational Foundation just announced they have education grants available! If you're an educator developing or disseminating critical thinking materials, take a look.