Hello!
Now I have finished a few authoring tools for HD DVD. You can download them on my site (iHD.shlooptoop.de, I hope, that it will be a strong community later.).
At the moment the tools are finished, but there could appear bugs, so if you found one or if one of the tools don't implement the languages right, please put it into the Bug Trap (you find it there too). All of the tools need the .NET Framework 2.0 from Microsoft. And of course I would like to get a feedback, what I could improve and so on, you can post it here or in the forum on my site.
I hope, I have done something useful.

Best wishes

Dave Jacobi