I found a very educational video on Google Video. The True Story Of The Internet _People Power is a thoroughly fascinating video, which tells us about the history of Web 2.0. It talks about Digg, YouTube, MySpace, Facebook. It profiles the founders, Mark Zuckerberg. This is a Discovery Channel program. You could also download this from http://science.discovery.com/tv/download/about/about.html
Absolutely fascinating and educational video. I learnt a lot. A lot about the people who transformed the Internet. And our lives.