The VS Ecosystem team has released the Visual Studio 2008 SDK 1.0.

We also released, for the first time, the new free Visual Studio 2008 Shell redistributable runtimes for both Isolated mode and Integrated mode.

http://msdn.com/vsx has the links to the SDK, and Shell downloads, and other resources.

The Visual Studio 2008 SDK is required for development and testing tools and programming languages that target the Visual Studio 2008 Shell. For more information about the Visual Studio 2008 Shell, visit Visual Studio 2008 Shell overview and Visual Studio 2008 Shell details.

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Visual Studio, SDK, Microsoft