CBS Action in the UK show the cropped version, for starters.
I was just going to post that. It's the Doomsday Machine now, and in standard definition - it looks stunningly bad.
What was so bad about it? The cropped framing? Or the SD picture quality or both?
I would never want 16:9 to be the only version available, but I would be interested in seeing it presented properly, cropped judiciously without in-frame tilting, in full 1080p with the new widescreen visual effects. I'm sure there are exceptions here and there, but I feel that most of the live action shots in TOS and TNG would not be detrimentally hurt by trimming the top and bottom.