The beta version of the Kinect SDK for Windows is available. The SDK enables developers easy access to the capabilities offered by the Kinect device connected to computers running Win 7. The Kinect SDK includes drivers, rich APIs for raw sensor streams and human motion tracking, installation documents, and resource materials.
The Kinect SDK is available for C++, C#, and Visual Basic developers (Visual Studio 2010).
You can download the 20MB Kinect SDK from this page: Download Kinect for Windows SDK beta.