Plain DVD with DIVX can do HD
I've seen 2 nice quality planet earth episodes in HD on divx quality, that fit on one 4.7GB dvd.
So that's about 2GB per hour to do 1080p HD.
Why is the industry trying to rip us off with those "blu-ray" and "hd-dvd" formats which are expensive and unnecessary, while all they really have to do is to modify a plain dvd player a bit and equip it with a dvi/hdmi output.
Perhaps *this* is what they have done, and it's not really "HD-DVD", but plain divx HD quality-ish DVD, which 'd be fine.