I guess my critique would be make it more obvious what has video published. Maybe an Icon on the Agenda grid items. This could be surronded by a link that took you straight to the Channel9 page instead of it being a two click process. The link to the Channel 9 video page is also below the fold on a 1024 X 768 display. (
https://sessions.microsoftpdc.com/public/timeline.aspx) Its a lot of post backs to the server to get to a video.
All I am saying is the UX looks to be a little rushed. They could of learned a lot from the VisitMix design. (
http://sessions.visitmix.com/) I think Visit Mix it very obvious how to get to the content. 1 point Channel 9 team (creators of VisitMix) 0 points Vertigo (PDC site creators).
VisitMix its organic content centric its hard to say if all the sessions were made available. PDC it is agenda centric where you could easily miss the fact that the content is available. Next time guys maybe include the agenda and make the content easily discoverable. Why tape the whole thing if you have to dig to find the content.