Universal still seems to be the biggest offender cranking up the DVNR button. I've heard Dragonheart and Apollo 13 look much better on HD DVD, but I don't have those films yet.
I've had two HD DVD discs go bad, and fret that the rare or superior titles in my small collection are going to rot down the line.
Been wondering if someone should collect the info out there about converting HD DVD to Blu Ray. For preservation purposes only of course.