I'm in Southern California. All of the broadcast network HD channels (ABC, NBC, CBS, FOX) are out. The SD versions are still on. I've tried calling customer support several times. Each time, get to the point in the system where it says the wait time (approximately 4 minutes.) After 4 minutes, I get cut off.
I've got all of my locals and Sirius, but got a black screen on Animal Planet a few minutes ago. Tuned to Animal Planet just now and it seems to be working, so it looks like they're actively working on it and getting things back up.