Many DVD authoring professionals may be wondering how they can get started with HD DVD. Probably the first thing to do is to download the iHD Jumpstart kit and get yourself a good XML editor (like the free Visual Studio Web Developer edition) and a graphics program like Photoshop or the Microsoft Expressions beta. This will allow you to create iHD content and play it back on your PC.
But the tools aren't much good if you don't know how to use them. You can look at the very basic samples in the iHD download, or look at some of the samples on my blog, but the best way to go from zero to hero (*cringe*) is to get a good book on HTML programming for the web.
iHD's concepts are very similar to those used on the web -- you have some content elements (like divs, buttons, and paragraphs) and then you make them look pretty by giving them styles (like CSS -- Cascading Style Sheets). You then make things happen by writing small blocks of script code, just like a web page. The only thing that doesn't have a good parallel with web programming is the XPath-based timing engine, but hopefully I will be writing more about that in the not-too-distant future. You don't really need to know much about XML to write iHD; learning HTML is probably enough to get started, and any decent XML editor will help write the correct XML syntax for you (or, at least, tell you where you went wrong :-) ).
There are also lots of references on the web for HTML, CSS, and Script... unfortunately I don't have any personal recommendations right now; let me know if you find something particularly good!
Development Resources Introduction to HD DVD Authoring Getting Started with HD DVD (includes link to