Greg and Linus sat down for an open discussion about Linux and its 20th anniversary. They even take questions from the audience. This is from the LinuxCon Japan 2011 held in early June. They had a very similar discussion in August at LinuxCon North America but the video for that hasn't been released yet. Having seen both, I think this first one actually covers more stuff. Unfortunately the introducer takes a few minutes before we get to see Linus and Greg. In webm format.
If you can't view it in your browser or would like to download it, here's the link:
20_Years_of_Linux-Linus_and_Greg.webm (170 MB, ~51 min)