Xaml - Your unofficial 3D file format...
Since I made the assertion in my last post that Xaml is as good a way as any to import 3D models I have received a few requests for more information on the "Xaml 3D file format". Clearly Xaml is so much more than a 3D file format (or should I say so much less?), but I certainly do not want to hold you back by arguing semantics. :) To that end, I have created a wiki on the "unofficial 3D file format" here. It's just a bunch of snippits of the 3D objects I use frequently. Let me know if it helps (or if it doesn't, let me know and I'll do what I can.)
PS - If you have been frustrated by RotateTransform3D in build 4074, there is a hint in the wiki and a link to a small console app to convert Axis/Angle to a QuaternionRotation. (BTW - This app also demonstrates how mere mortals might find TypeConverters useful.)