Those are still the MPEG2 signal being mirrored to the regular channel numbers. TNTHD 75 is the exact same MPEG2 signal as TNTHD 245.All these have HD MPEG4 counteparts on there respective channels. Therefore it now fair to include them:
HBO East
Showtime East
ESPN2HD
ESPNHD
TNT-HD
BTW: This thread is crazy to think that the HD channels PQ are not good!!! D* have all channels except the MPEG2 channels in FULL HD Resolution. The PQ is better than all others carriers at the moment!