Here are some lectures given @29c3 that I have watched (many more to come!) and found noteworthy – so far.
The keynote “Not my department” by Jacob Applebaum
Security nightmares “Damit Sie auch morgen schlecht von Ihrem Computer träumen” by Frank Rieger and Ron (in German).
Also, Everycook. As one member of the audience put it: “Shut up and take my money!”
More selective bits will follow.