A very cool product. 3D authoring that outputs WPF/XAML so you can directly author Vista applications. From their homepage:

Zam 3D is a 3D XAML Tool for Microsoft Windows Vista Application Development.
Provides developers and designers with a quick and easy solution for creating 3D interface elements for Microsoft Windows Vista based applications. It also acts as a 3ds to XAML and dxf to XAML converter.

I've played with pre-release versions and it is a good tool. Take a look at the electricrain page directly for more information.