i believe letterboxing will still occur in hd if the movie was shot at a certain aspect ratio. Many bluray movies won't fill up the entire screen either. I believe anything over 1.85:1 will have black bars even on a widescreen TV.
Channels like A&E HD are something entirely different unfortunately. They seem to have letterboxed hd content and they just stretch the content so it fits 16:9 ... blasphemy. Drives me mad, kinda like how my father in law uses the zoom feature to get rid of the black bars on his hd screen. It fills up the whole space but looks like dead ass warmed over.
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