Normally I’d roll my eyes with him at Microsoft, but as it happens, the video plays fine for me even though I’m not running Windows and don’t have Silverlight. They appear to be using an HTML video element with mp4 video. Did they change it after he posted?
Meanwhile—just for snark’s sake, this is what I get when I try to view any of Apple’s WWDC videos:
I wonder what sound technical reason lies behind this.