Actually all rooms at the Contemporary have a computer built in with an online concierge service and since July 2006 have had free internet use on it.
Besides that I know the Contemporary, Polynesian, Grand Floridian and Wilderness Lodge all have 35 inch wide screen tv's since all their rooms were renovated, however they are not HDTV's.
I do agree that all the Resorts need better channels that you could find at offsite Hotels, however I would assume part of the reason they would not have HBO, Shootime and etc is because some of the movies and shows are not for little kids to see, so WDW wants them not to be shown at the Resorts.