As for reporting problems via email, I don't remember the addresses off the top of my head but if you go to the various station websites, there is usually contact info for the engineering dept. I have emailed the engineers at Fox 50 and NBC 17 in the past with good results. This works well for general problems and requests.
If there is a problem with a show you are watching being in SD or some other more immediate problem, the best thing to do is to call the station. After 5:00 PM, it is usually best to call the news line number most stations have in the phone book and ask to speak to someone in engineering.
Also, you should check out www.nchdtv.com
and sub to the WRAL HD newsletter (you can do that from WRAL's web site)
I'm in Morrisville, off Davis Drive right next to RTP and I get the following channels with my Dish 6000 hooked up using diplexors and a POS old Terk TV 50 hanging on 2 nails hammered into the trusses in my attic.
WUNC PBS 4.1, 4.2, 4.3, 4.4, 4.5 (nothing is on 4.2 right now)
WRAL CBS 5.1 and 5.2 (sometimes they will run additional subchannels during special events)
WTVD ABC 11.1, 11.2, 11.3 (can't see the radar on 11.3 with a 6000 but keep forgetting to call to complain about it)
WNCN NBC 17.1
WLFL WB 22.1
WPTF UPN 28.1
WRPX PAX 48.1
WRAZ Fox 50.1 and 50.2
All the stations except WUNC 4 are located on the three adjacent towers near Garner. WUNC is in Chatham county. You should check www.antennaweb.org
to get the azimuth for the stations relative to your position. An Omnidirectional antenna or a rotator will probably be needed to pick up UNC for most in the triangle. WUNC is my worst channel and I usually only pull a signal in the 70's from them while I get 85-90 with most of the others.
I don't know if any of the stations are at true full power but 22 and 28 are definitely lower power than their FCC approval so they will come in sporadically for most in the area as well.
Yes, the Superbowl will be in HD. There is some info in the programming forum about it.