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HD is not anamorphic. It's frame is native 1.78:1. DVD has the anamorphic enhancement feature because it was originally designed for 1.33:1 TV's.
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Dan,
When I had my CRT front projector set up by an ISF tech, I saw very clearly that HD material was stretched vertically, and that the projector's picture had to be vertically squeezed by 25% to make the picture correct.
This is exactly the same procedure that is used for anamorphic DVDs. So HD IS anamorphic (or, to put it another way, it requires the same squeezing for 4:3 TVs that DVDs do that are "enhanced for 16:9 TVs"). This is exactly what I was told to expect by Guy Kuo when I first bought my DTC-100 HD receiver, and my experience with my current front projector and my previous one confirms what he told me.