for fun I just pulled up the lists that I know of. On KU (30" dish) there is PBS HD and now Pentagon HD
C-band has the following
TBN HD
I'm agnostic
QVC HD
I'm male
Sprout HD
I'm not 2 and I don't have kids
EWTN HD
I'm still agnostic
Jewelry HD
I'm still male
Sportstime Ohio
Don't live in Ohio, nor do I care about their teams
NBC HD
The one channel I can get OTA
Telemundo HD
No habla espanol. (Well, I do, but I don't enjoy Mexican TV at all).
Ion HD
Meh. Plenty of other channels where I can watch crap that's "Edited for Content".
Pixl
Still male.
Escapes
Wow.. The Scenery Channel from Back To The Future 2 is now reality. 
ABC HD
Nothing good on
Reelz
Seen maybe one good movie on Reelz in a year
BYU TV
Still agnostic
Nebraska PBS
PBS sucks
NASA
Ok so there's one thing maybe worthwhile
Weathernation
I have access to a NOAAPort feed.
and some network feeds (for the affiliates)
right here is the list
Yes there are feeds but mainly are sports feeds (come and go). Also note most of these you need a special receiver that costs $100 or more.