I've been watching KSEE-DT, the local nbc affilliate, in high definition since last July on my ota tuner. They and the ABC affilliate are the only locals doing HD, though all the others with the exception of channel 18 (pbs) are broadcasting an SD digital signal ota.
Don't know why Comcast isn't carrying KSEE-DT, or any of the other local digitals.
The CBS contract disputes only affect markets where the local CBS affilliate is owned and operated by CBS. The local CBS station here in Fresno is owned by Clear Channel Communications, the radio station conglomerate.
They are broadcasting a digital signal at 1080i, but it's an upconvert of the analog feed (with a nasty stretch) as they are not yet equipped to recieve and pass on the CBS network HD feed. They originally announced that they would not be doing any HD until a year after getting on the air with thier digital signal in mid-August, but the engineer told me a while back that there was some chance of getting it by the end of the year.
Comcast has been pretty aggressive about adding new HD content in other markets, hopefully the same will happen here. In the meantime I'm getting more HD from DirecTV and OTA than what Comcast offers, admittedly at much greater initial expense for equipment.