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ValveTime.co.uk | Valve News, Forums, Steam
http://www.tgdaily.com/2005/12/13/directx-10-preview/
Well, with the most recent SDK they put in a few components of DX10, which is pretty cool. They also mention that Windows Vista will be taking advantage of DX10 features.
And I really don;t know much about this stuff, but I figured at least a few here would be interested.