I normally do not point out to progs of the competition, but you might want to look here:
http://www.dvd-logic.com/hddemuxer.htm
Personally I find it highly overpriced, but it might sell as long as there is nothing else. But maybe you can also simply demux using the good old VobEdit, I did not try this yet (I just have my Xbox360 drive!)
But yes, I do know a lot of the HD-DVD format, simply because it looks a lot like the DVD format. I always considered this a major advantage over BluRay. There are a lot of people out here that know the DVD format, and it will not take much time for them to master the HD-DVD format. At least not the basic format (as used for instance by Video Studio 10), the advanced format as used on commercial titles may be more work.