long time lurker first time poster here. I was just reading this thread and felt compelled to post my recent flash experience. When i first got my 2010 i7 MBP, HD video worked great, even in full screen. I have automatic graphics switching on so it was doing a good job making it's own decisions. The other day however, i installed the Flash Player Gala beta, and immediately i started to experience some pretty bad stuttering if i played HD in full screen, unless i forced discrete graphics with gfxcardstatus. So i uninstalled Gala and went back to Flash 10.0.45 and its flawless again. So anybody that has stuttering and the Gala beta, that could be your problem.