I only caught about a half hour or so, but the Bill Moyers special "Buying the War" seems like it would be of great use in a rhetoric class. It's essentially an analysis of media coverage during the run up to the war in Iraq. What this means is that focus throughout (or at least what I saw) is on evidence, argumentation, credibility, tone and the like. While much of it is a critique of current journalistic practices, there's a whole lot going on that could be brought into the classroom.

It might be too off topic for some 309 courses, but it offers vivid illustrations for several key rhetoric and writing concepts.

http://www.pbs.org/moyers/journal/btw/watch.html