If you want to start learning about the new Windows 7 (download link) Sensor and Location platform, you can now access the Beta MSDN SDK documents online! With this documentation, you can learn how to write sensor-enabled applications with the Win32 COM Sensor API. You can also learn how to add location awareness to your apps with the Win32 COM Location API, or the Location scripting interface.

More info: Sensor SDK BETA documentation | Location SDK BETA documentation