I apologize that this took so long to get out here. I've been busy and it has been interesting to get this hosted on MS.com. I have some other similar samples coming and I think that I'll just host them here directly. I mostly took the demo code that Nathan and Robert had and cleaned it up for public consumption.
Take a look at it and let me know what you think. As Avalon moves forward, I'd like to keep this example up to date and add to it.
If you are interested in Avalon 3D and you haven't found his site yet, DanLehen has some great samples up and running.