1) Sorry, but even if a consumer oriented HDTV modulator existed (which I don't believe it does) you would still need an HDTV receiver in your bedroom to decode the signal. In that case, you might as well just run the original signal (antenna, satellite, catv) to the bedroom.

2) I don't think this is known by anyone who will tak about it. Even if the TiVo doesn't have it, there are plenty of cheap modulators you can buy. Or you can use an old VCR.

It seems like a shame to me to take an expensive plasma set and feed it with coax, which is the lowest quality signal available (and isn't stereo).

-Dylan