I saw TWC today again on BHN, and they're now letterboxing their IS2 feed onto SD. Although I think it's pretty neat to see the IS2 now, I'll still miss 24629
If I were to say something though, this is something I'd be against, unless TWC themselves were the ones letterboxing HD onto SD. Why? The text on screen is barely readable on the SD feed, and because the network themselves does not send out the feed this way.
Here's a couple screengrabs I got.