Well, I've not been able to even view the WWDC presentation yet, as the stupid all-singing-all-dancing page Apple has thrown up crashes the video feed after about 5 minutes. Picture stalls but sound continues.
Why Apple can't just use the tried and tested YouTube or Vimeo, or ANYTHING except their own web-guys I don't know.
The old Apple event vids used to just be on an simple webpage as a video. No frills, no Twitter feed, just good old-fashioned reliability.