Flash video vs HTML5 video
There has been a lot of misinformation about the future of the Flash Player recently. Fortunately Jan from the Streaming Centre has avoided the political/fan boy nonsense and conducted an exhaustive performance comparsion between HTML5 video and Flash video.
The bottom line is that if Flash video is hardware accelerated (A feature of 10.1) the performance difference is negligible. Now if Adobe (with the help of Apple) could just sort out the mess that is the Flash player on OSX, the CPU hog perceptions might start to disappear.
Read Flash Player: CPU Hog or Hot Tamale?

CONVERSATION