Are you sure it was not true HD? I've seen other shows on that channel that are definitely upcoverted as you can tell that it's not 16x9 but instead still has small pillar boxes (I guess they call it 14x9). Whereas that show last night I'm referring to was true 16x9 with no pillar boxes.
It was stretched and upconverted. Stretch-O-Vision, even if it were HD before the stretch, is NOT HD after the stretch. Horizontal resolution is greatly reduced by this process. Not to mention many people--myself included--find the resultant picture unwatchable.
Moreover, what is the point? HD is all about video fidelity. If circles become ovals, and thin people become fat, is that fidelity to the original?
If people want to watch Stretch-O-Vision, let them distort their own display device locally.