William Whyte’s “The Social Life of Small Urban Places” is a good example of ethnography. More micro-sociology. A great docu, 1 hour long, and available on Vimeo:http://vimeo.com/6821934
There’s a documentary on the Tuskegee experiment called the Deadly Deception (about 1 hr long, but you could also show parts). It’s available on Youtube. The documentary itself is a bit old (1992, maybe?), but it’s a good one. It does a really thorough job showing how many times over the tenure of the experiment subjects were taken advantage of and/or refused treatment, and how researchers justified it to themselves, even after the justifications were clearly irrelevant.