If you are wanting to experiment with writing code for Windows 7 that leverages the Sensor and Location API, you may be interested in the Enhanced Default Location Provider (eDLP) available from Microsoft on MSDN. The enhanced default location provider is a WPF application built on top of the Windows 7 Beta SDK and the Windows 7 Sensor and Location Interop Library.
To use the tool you will need the following prerequisites:
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.NET 3.5 SP1
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Visual Studio 2008
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You can also find more information on each of these at this link http://code.msdn.microsoft.com/SensorsAndLocation.
To run the application you need to open the solution for the Windows 7 Sensor and Location Sample Library and build it.
The next step is to open the solution for the Enhanced Default Location Provider add a reference to the Windows 7 Sensor and Location Interop Sample Library DLL and build the project.
To use the the application you will need to run the WPF application as an administrator.
To change your location right click on the map. Clicking the "Save Address" button will save the address as the Windows default location.