Pump Up The Volume: The History Of House Music
Here is a documentary from 2001, produced in the UK that I personally discovered circa 2007 by downloading it from a BitTorrent website. Pump Up The Volume is a documentary showing the history of house music by those who made it as well as by those who pioneered it. As well as great narration and the telling of the back history of the genre, it features many talking head interviews from the who's who list of house DJs from New York, Chicago, across America, and all around the world abroad international.
It is a three part mini series with each episode lasting about 50 minutes in duration. I took the liberty to put all the parts together into one video and upload it to YouTube. Please take the time to watch it in its entirety. Not only is it insightful and entertaining, but it is the most comprehensive documentation on the genre that I've ever come by before. Here's the video:
Additionally for those that are interested there is also a companion book and a great soundtrack CD available for the documentary. I highly recommend picking those up as well.