Ok, here’s your answer! (That I just made up.)
HD has less to do with pixels than display size. If you put DVCPRO up on an IMAX screen it wouldn’t look quite so “HD” anymore, would it?
So you’ve got to look at this in a “pixels per inch” kind of way. Using some very hasty math I just determined that a 480p file on my 23″ screen (at a height of 5″) has roughly 3 times the pixel density than a HD picture on a 50″ 1280×1080 HDTV (at a height of about 30″).
So that online trailer should appear to be 3 times as sharp as a network HD show! If “3 times as sharp as HD” doesn’t count as HD I don’t know what does.
I dunno. Any good for a made-up answer?