Hulu was pretty crappy - dual CPUs loaded >85% but not pegged at 100% when running full screen 1920x1080. At full screen the video jerks a lot and audio gets out of sync. Running in a windows the audio/video sync up and the video stabalizes, CPU usage drops to around 50% for both cores.
I updated to the Catalyst driver using Mobility Modder and then the Flash 10.1 beta - that's supposed to enable hardware acceleration for Hulu flash. Doesn't seem to have done much for Hulu but it did render my CCC non-functional. Hulu is still >85% at full screen but seems a little less jerky.