We've recently published the last couple of the first round of Channel 9 videos that Brian Keller taped a few months ago.  Read about it on Brian's blog here: http://blogs.msdn.com/briankel/archive/2007/04/26/more-channel-9-interviews-with-the-team-foundation-server-team.aspx

Check out the full list here: http://channel9.msdn.com/tags/vsts

Brian