[ From danlehen ]
We hinted at the PDC that the new Windows Client Platform (codenamed Avalon) was going to include support for 3D that would blur the line between the 2D and 3D worlds. If you have been browsing the Longhorn SDK on MSDN you may have noticed from the documentation refresh that the first bits of 3D support in Avalon made their way into the Longhorn build we distributed at WinHEC.
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And a screenshot , very cool. Make sure you checkout the XAML in the preliminary documents on MSDN.