Supposedly a nice flash pre-release is out, and if you have a supporting video card (I have NVIDIA so that is where the link goes), you can get it. Haven't read everything about it but at a glimpse it says no more stuttering with videos and certain cites like youtube, will produce HD quality. Hopefully it's as good as it sounds. I haven't updated my vid. driver in ages.
http://www.nvidia.com/object/adobe_flashplayer_plus_nvidia.html