Have you ever been working on an HDi project and needed to look up a method name in Annex Z, but you don't have it handy (or access at all)?  Well, luckily the Interactivity Jumpstart Kit ships with the HD DVD Script Object Model as a Visio file and a PNG.  You'll find this very useful file in C:\Program Files\HD DVD Interactivity Jumpstart\Documentation.

And, while you're in there, check out the CHM file.  It has all the command line options for the simulator and the validator, keyboard mappings, and information on how to use the CreateACA and CreateDiscID tools.

Good stuff.