watching some HD programming is prolly the most accurate and quickest research you could do.
I know of no list provided. Thats a networks' cliebtele so contact info would be coveted. It's as easy as watchin and cold-callin', though.
I agree with Grinner... I know of no comprehensive "list" of HD commercials anywhere. Best bet would be to plop down on the sofa with a pad and pencil in hand.
It is interesting to watch for HD commercials though... and the mix that you will see during network commercial breaks. Some are full-screen HD with a letterboxed version running simultaniously on the NTSC channel, some are HD but pillerboxed with a full-screen version running on NTSC, some are full-screen HD but with a side-cropped version running on NTSC, some are full-screen HD but obviously upconverted from letterboxed NTSC, some are pillerboxed HD but upconverted from full-screen NTSC... etc, etc.
The most wacky thing to see is an NTSC-produced commercial airing on HD, but where the original standard-def spot was letterboxed, yet they still show the full frame (not cropping for 16:9). There you get letterboxing nested inside of pillerboxing... with the thick black bars both on top/bottom and sides of the spot. Lots of wasted screen real estate there.
It's pretty wild.
Fantastic Plastic Entertainment, Inc. fantasticplastic.com