I've been watching quite a few on Netflix, lately. A few of the ones that stood out are:
Maxed Out: A look into the world of credit, creditors, and how the system is set up to keep you in debt
Wal Mart: The High Cost of Low Prices : Shows some of Wal-Mart's shady business practices and the effect the franchise has on small businesses
Forgiving Dr. Mengele: The story of an elderly Jewish womant who survived Auschwitz and the infamous Dr. Mengele (this man experimented on living humans! Even going as far as sewing twins together or injecting things into their eyes to try to change their eye color.) The female focus of the documentary is trying to make peace with her horrific past by finding forgiveness for this man.
Bigger, Stronger, Faster: Are steroids as bad as we think? Well yes.....and no. Interesting and funny story about three brothers who use steroids and the effect on their family and their lives.
Waco: The Rules of Engagement: The story of what took place when the ATF tried to take on cult leader, David Koresh, in Waco Texas. The end result was the death of several men, women, and children. Watching the videos they made before they died (they seemed like nice people) was chilling. The biggest ATF fuck-up I can remember.
Auschwitz: Inside the Nazi State: Multi-Part documentary about the most infamous Nazi death camp (I had just read Maus and I was obssessed with WW2/the Holocaust for a while).
All of these were very good but, I guess any documentary is if you are interested in the subject. Others I liked are pretty well known (Supersize Me, Tyson, Sicko). Anyhoo, there's my contribution to the thread.