Well VC1/WMV3 acc is only available for a few chips like G98 / NV 9300. So you an forget that. And currently h264 does only work with very few videos out there, but at least the NV dev are working on newer profiles (right now only up to 4.1). As long as it works the cpu usage is really low - even for hd material. Now it just has to be improved. Lets see if ATI provides mplayer patches too to demonstrate their new acc libs.