I was amazed today after receiving the new MacBook Air 13" (2.13 Ghz, 4GB RAM, 256 SSD) at how well it decodes H.264 video. I attached the full Blu-Ray specs of the file. (only the audio track was compressed to AAC, video is uncompressed). Long story short, playing through Quicktime X the CPU never went above about 18% meaning practically the entire video was offloaded to the GPU I could skip to any part of the movie with absolutely no lag or dropped frames. Coming from a 3 year old MacBook Pro that cannot even play a Blu-Ray without being unthinkably choppy I am very pleased. Just thought I'd share my great results. I have not tested to see if the Displayport/HDMI out supports audio yet though.