Adobe just published their Flash Player 10.1 pre-release. They claimed it support hardware graphic acceleration. However, as usual they may not port any improvement to Mac. They claimed it’s because Apple didn’t provide them API to make the improvement.
Anyway, I took the risk to try it. Amazingly, even my relatively old MacBook Pro can have 20% of CPU resource gain when playing Flash video.
Before installing, you should quit Safari. And I ran the uninstaller for Flash as well.