I found this thread and thought it was very interesting and the comments from PBS about HD production. I am sure that all channels have this problem and that is why HD programming is slower to develop. I sounds almost the same story we hear about VOOM. Makes you stop and think
http://www.avsforum.com/avs-vb/showthread.php?s=&threadid=476849
http://www.avsforum.com/avs-vb/showthread.php?s=&threadid=476849