Flash works tested it on Hulu.
However full-screen will crash the browser (it will take over your computer). Actually this will attempt to do the fullscreen but will just lock up your computer and give you no picture. Audio seems to continue.
However, Disabling Hardware acceleration on the Flash Settings allows Full-screen to work again. This may be related to ATI cards, could be different on NVIDIA cards.
Using the hardware acceleration was also causing some minor tearing in the video occasionally.