I'm surprised to see all of the negative comments about PBS on here. I've always thought that PBS HD was one of the best HD channels available. Sure, it's all kids stuff before 9AM, but the rest of the day it's grown-up programming.
It's looks like your mileage may vary depending on your local market, but here in Indianapolis PBS HD has great visuals in a wide array of formats, including historical and scientific documentaries, nature shows, investigative reporting, the arts, travels, and musical performances.
A quick look at my local channel (WFYI) shows the following produced-for-PBS series playing this week in HD:
American Experience
History Detectives
Nature
Nova
Smart Travels
Soundstage
Interspersed between all these great series is a wide variety of compelling HD programming. Maybe I just happen to have a great affiliate, but I would place my PBS HD channel near the top of my list.
Edgar in Indy
Former Dish HD customer, now happy with Insight Cable until Dish offer HD locals