sofaking, whatever each web service decides to put out for their format is up to them. I think it would be an advantage to compile a list of channels along with what format & resolution they make available on the Internet. it would probably take the knowledge of each show and its resolution from each web service individually (i.e. House may be available in SD on Hulu, Amazon, and Netflix, but in HD on Hulu Plus, Amazon, and iTunes)

in order to get the web services' attention, it may take petition to have HD for more shows than they currently offer.