Of these, I'd recommend (in the order that I think is best):
Nowell Strite & Shawn Rider from PBS supposedly gave an amazing talk
(I missed it, but those guys are awesome)
Ted Leung's keynote
Andrew Godwin's talk on South
Adam Fast's intro to GeoDjango
Chris Wanstrath's talk on Git, but only if you're not already using it
Simon Willison's cowboy talk is mostly detail free, but interesting
I liked Avi Bryant's keynote, but I think that you'll have to wait for the video for that, since he didn't use a deck.
The guy who filmed them is working on them now - I know nothing from an official standpoint, but I ran into the guy doing them Saturday morning and he mentioned he was working on them already.