A few have asked me to give my "picks" for best materials from the PDC for people to watch, so here goes. Note, that not all of the sessions from day 3 and day 4 appear to be available yet on channel9, so most of these will be from day 1 and 2. Also, here's the link that you can use to browse all of the publically accessible session recordings:
Keynotes:
All the keynotes are worth watching as they give the intro pitches to the new technologies, and have pretty good presenters (except David Tredwell, not a good choice there).
Keynote #2 - Windows7, New Dev. Tech, Live Services, and Office 14
Keynote #3 - Don and Chris's Lap Around the Azure Services Platform (all demo)
Keynote #4 - All about Microsoft Research (cool stuff in second half)
Sessions:
So here are my picks that are "best-of" taking also into account the things that I think you guys would be interested in, as well as what's presently available (mostly day 1/2):
Other Fun Stuff: