I liked The Bay. Seriously eeked me out...
Re-posting these here:
This Film is Not Yet Rated (2006)
Fantastic expose of the MPAA - I liked this one a lot.
...
Cleanflix (2009)
Great documentary about a video rental business in Utah that purchases R-rated videos and then edits out the sex, violence, and language so that the wussy Mormon community can watch them. Amused the Hell out of me.
Definitely recommended.