Socal should be getting more HD in the next few weeks/months:
KWHY HD (MundoFox HD)
PAC12 LA HD
PAC12 National HD
TWC Sports net HD (October 1st)
TWC Deportes HD (October 1st)
KEYT HD (select areas that get the channel currently some areas are having the channel dropped completely and others are having it transitioned to digital) Looks like RF channel 3 (63MHz) is being freed up in some areas.
Also lookout for KAZA HD as they have launched Azteca America in HD in Los Angeles.
Dallas is supposed to get Azteca America HD soon.