I've got three bullets on the keynote:
The MSDN and TechNet lounges are definitely a hang-out. The Surface table always has a crowd. Between us, we had some good conversations with a couple dozen attendees, and the feedback was consistent: they had no idea that there was so much on the sites beyond the subscriptions that's freely available.
A few quotes from today:
Pics from the lounges:
TechNet's #1 fan! or "What IT guys will do for prizes"
Finula and friends enjoying some refreshments...
The Surface table
MSDN Bar and pool table