We will probably see many more comparisons like this
HTML5 vs. Flash comparison finds a few surprises, settles few debates -- Engadget (http://www.engadget.com/2010/03/10/html5-vs-flash-comparison-finds-a-few-surprises-settles-few-de/)

Bottom line:
- HTML5 is better on Mac in Safari; not so much in Chrome;
- Flash is way better on Windows (due to GPU assistance).

It will take some work and time to replace Flash...

Diogen.