OK I guess I don't know for absolute sure, but I feel like the picture quality improved significantly on most if not all HD channels ever since the "TurboHD" thing started. I hadn't said anything until now because I wanted to see if it stuck, but I feel it's been better for long enough now. The main difference I have seen has been fewer artifacts during movement, but I also think there are fewer compression artifacts in general. Has anyone else seen this improvement? Is is due to MPEG-4 compression? If so, I must have been wrong in thinking we had been on MPEG-4 for a while before the TurboHD thing started. Thanks for any responses. Forgive me if this has already been covered.