Adorei os slides: http://blog.millermedeiros.com/2010/07/html5-overview/
Muito bom. Reparem no slide 18:
"Flash is not dead
For highly interactive content Flash still the best solution on most of the cases.
Each tool has their own purposes - HTML "is king" on many things that Flash lacks too - pick the tool based on the project, not the opposite."
I agree. =)