I'm 10 minutes in so far and I'm beginning to lose patience, not only with the interminable history lesson, but also with the unbearable level of smug.
wait to get to the end, but the talk actually gives some points where XNU is slow
I'm looking for text, not video. I can't be bothered to watch something that I can read in a fraction of the time.
Terrible video player. It's one of those generic Flash players which one sees pretty much everywhere, but it's incapable of skipping in the video properly for me, the times are often wrong, the fullscreen is buggy.. Just a horrible experience.
I would also check out Amit Singh's book on the subject, "What is Mac OS X?".