This is the announcement you've been waiting for.  You've seen me post a “teaser blog” about this before, but I'm delighted to say the real thing is ready for download now.  Look at all the goodies you get:

• HLSL support for Pixel Shader & Vertex Shader 3.0
• Effects Framework performance improvements
• Pre computed Radiance Transfer improvements
• New Sample framework
• New & Updated Samples
• Improved Documentation
• PIX tool for better debugging of Direct3D applications
• Introduction of the Preview Pipeline for easier content creation
• and.. Winforms-like UI features to add extra pizazz to those full-screen DX games!

You can get the SDK here.  Enjoy!