I have both Flash 10.1 prerelease and 9.11 CCC+drivers, and I have to say, I am pretty happy with the result. Xp64, AMD 710x3 @ 3.55ghz, 4gb 1092mhz memory, and 4870 512mb videocard. I monitored my GPU-z while running 1080p HD movie trailers off firefox, and it is definitely quicker to play, and maintains smoothness while moving windows around, an overall more fluid experience. Neato. The GPU load peaked at about 10% while doing some limited testing.
Should do wonders for porn, too!