I guess most of us (belgians) do not even know what 'channel 9' is about. Well: if you fly United Arilines in the US, you can actually hear the pilots in the cockpit using the in-flight entertainement system. And you have to tune in on channel 9.
So some crazy guys in Redmond want you to be able to hear (and talk back to) some of those developer-pilots that are steering the Microsoft Products.
It's an experiment, but again it shows how Microsoft is moving towards openness and transparency. I like the fact that it has video, I really feel I get to know this company better.