The Windows SDK for Windows 7 and .NET Framework 3.5 SP1 provides the documentation, samples, header files, libraries, and tools (including C++ compilers) that you need to develop applications to run on Windows 7 and the .NET Framework 3.5 SP1. To build and run .NET Framework applications, you must have the corresponding version of the .NET Framework installed. This SDK is compatible with Visual Studio® 2008, including Visual Studio Express Editions, which are available free of charge.

Please see the Release Notes for the full list of supported platforms, compilers, and Visual Studio versions and any late breaking issues. For detailed information about the content in this SDK, including a description of new content, please see the Getting Started section in the documentation.

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Build applications on a solid foundation; enable richer application experiences; and integrate the best of Windows and web services. The features and technologies of the Windows 7 operating system enable you to build the next generation of software applications.

More Info and Download : http://code.msdn.microsoft.com/Win7DeveloperGuide