I was also surprised to see the "simulcast in HDTV where available" type of graphic at the start of last week's episode (I recorded it and watched it over the weekend).
I'm enjoying network television more and more now that most of my shows are being broadcast in HD: 24, Alias, CSI: NY, Joey, Lost and Will & Grace. The only two shows that aren't are The Simpsons and That 70's Show.