Flash Player 10.1 beta 2 is now available on Adobe labs with numerous improvements under the hood. If you are interested in experiencing the tremendous performance improvements due to H.264 hardware decoding (with supported graphic cards on PC), I would recommend taking a look at the 1080p videos in the HD section of CBS.com. What used to be CPU intensive playback, is now smooth, low CPU, 1080p playback.

Flash Player 10.1 on Adobe Labs.
1080p videos on CBS.com.