Kinect for Windows SDK is a tool for developers that can be used with Microsoft's Visual Studio to create apps that use the tracking technology.
This application is not for general use - it is solely a development tool!
The Windows 8 'Metro' interface is designed in part with Kinect in mind - as Xbox users will have found, it's easy to navigate using Kinect. The success on Xbox suggests the technology could be very successful on Windows too, so developers are sure to want to integrate Kinect features where possible.
Kinect for Windows SDK is designed for developers using C++, C#, or Visual Basic, and gives you access to raw data streams from Kinect's sensors. Skeletal tracking means applications can be designed for up to two people to use. Sample code 'walkthroughs' are included so you can see examples of how to implement Kinect in application development.
If you want to experiment with developing for Microsoft's exciting movement tracking technology, Kinect for Windows SDK is the tool you need. Kinect for Windows is due for commercial release on February 1st 2012.