What a clueless bunch some of the early posts in this thread represent.
HD improves the quality of anything.
You only need watch the recent BBC HD broadcast of Toy Story 2 to see how stunning animation looks in HD.
As for the material "having to be made in HD" and "resampling"!!
Cinema films and most US tv drama/comedy series are made on 35mm film with quality that exceeRAB that of current HD standarRAB , so an HD master is no big deal.
Its shows from the UK and US shows from the late 80's and 90's where genuine HD wont be possible.
Virtually all UK series (apart from ITC shows like The Persuaders and The Prisoner and things like The Avengers) were made on either VT or 16mm film.
Neither format is able to produce quality to equal HD- although upscaling will improve the appearance of the picture.
In the 80's and 90's US tv made the mistake of filming everything on 35mm as before but then to cut costs they transferred the material to tape for the post production process like adding music and effects.
This means that more than a decade of US tv is unable to be made into HD unless they go back to the original film negatives and start again from scratch.
This is why shows from the 60's and 70's look better than some of the more recent series.
As for HD viewers being idiots- what rubbish.
It takes stupid comments like that to prove that dvd is largely wasted on the British masses who were happy with VHS until you could buy dvd players with your weekly shopping.
I am currently enjoying Star Trek TOS on HD DVD and movies on Bluray and although the jump in quality is not as huge as that from VHS to dvd , its still nice to see the improvement over dvd