The Story of Stuff with Annie Leonard. A really fun look at some of the underlying causes and solutions to our obsession with stuff! There's lots of good information (and a higher quality version of this video) on the The Story of Stuff website.
A humourous look at the development of the age of oil and its role in world politics and economics - the information in this video should be in every high school textbook, but I'd bet you'll be hard pressed to find it in any.