If you are a fan of the Hobbit, there is a series of videos on YouTube which Peter Jackson and company have been putting out to hype the movie. This has been going on for about a year before the movie was released and includes interviews, set designs, etc. One of the interesting points I found was that while the movie was shot with digital cameras, they are able to tell how much film they would have used if they had used film - 22 million feet and they hadn't done re-shoots or pick-ups yet. While admittedly it is a trilogy, you can see how half a billion feet are used in two years by one studio.