Even those of us who are here can't see all the sessions we want to. I have three and four stacked across in most timeslots - and then I might end up spending that timeslot getting some vital "face time" with an RD or blue badge I don't otherwise get to see. But never fear, they're online within about 24 hours of happening! And what's more, you don't have to be registered to see them!
So, that Parallel native C++ talk that put me in the overflow room? http://channel9.msdn.com/pdc2008/TL25/ - watch the video, download the deck. The terrific Boris Jabes talk I lined up for? http://channel9.msdn.com/pdc2008/TL13/ - same deal. The MFC talk that hasn't even happened yet? The page is waiting at http://channel9.msdn.com/pdc2008/PC26/ and the video should probably show up Friday.
Want to find some more? https://sessions.microsoftpdc.com/public/timeline.aspx. This is just an amazing thing to do. It really increases the value for me of being here because it lowers my stress and worry about choosing the right session. It lets me concentrate on going to talks where I want to meet the speaker or ask the speaker a question, on going to the Labs and Lounge area to meet product team folks, and on enjoying the experience instead of frantically taking notes (or snapping pictures of demos). I think this makes me MORE likely to attend future PDCs, believe it or not.