True. I also left out Frames. Web 2.0 for me was too much about aesthetics, but AJAX is very close to JS. Both deserve a spot in an extended version of the history though!
The browser wars deserved a mention, probably in the Javascript section too, and the death of the "web safe" palette.
Embedded video everywhere is probably the biggest boon to designers in recent years, even if it's been theoretically achievable since Flash came onto the scene. Or earlier if you count animated gifs
The post also states that Flash was "freedom", which it was only in a design sens.