If you are teaching your students about how to evaluate online information, this site may be a good resource to include. While students may be familiar with the concept of looking at the source of a particular fact, they probably have not considered the features of web design that would make information more believable. This site could lead to some very interesting conversations about why we believe or don't believe what we see.
The Web Credibility Project - Stanford University: "The Stanford Web Credibility Project: Part of the Stanford Persuasive Technology Lab our goal is to understand what leads people to believe what they find on the Web. We hope this knowledge will enhance Web site design and promote future research on Web credibility."