I watched this new documentary yesterday called The corporation and I think it was a very interesting and complete documentary.
They explain what is a corporation, the history of corporations, what is the problems with bad corporations and analyse why, why they have now more power than goverments, what we can do etc.
This documentary isn't a corporations hater movie. There's is a couple business men who are interviewed and gives their opinions about what industries can do to stay a good one and a business of choice. The CEO of Shell was talking about how he decided to care more about environment and how he successed in polluting less and making a fair amount of profit and keep his shareholders happy.
Anyways, this is just a small part of the movie. If you can find it somewhere, it totaly worth it!
http://www.imdb.com/title/tt0379225/