I found a fast paced, funny, and fact packed tutorial about using the Wikipedia for research on YouTube. It was produced by John Gibson and Vibiana Bowman, librarians at the Paul Robeson Library at Rutgers, Camden where I worked a long time ago. Although written for a student audience, I think it might be better pitched to faculty or librarians who want to show their students how the Wikipedia addresses the issues of accuracy, authority, objectivity and currency. The unique thing about the text is that it is entirely based on quotes from Jimmy Wales, Wikipedia’s founder, and official Wikipedia policy statements.
The version on YouTube is a little fuzzy but you can find the original at the Robeson Library website where it comes with a quiz and a transcript of the text.