Sergey Zwezdin (Microsoft C# MVP) has recently put together a 3 part series about the Windows 7 sensor platfom, the Windows 7 sensor development kits, and programming with C# with the platform for these boards:

Part I:
http://geekswithblogs.net/sergun/archive/2009/06/15/windows-7-sensor-and-location-platform-what-is-it-part.aspx 

Part II:
http://geekswithblogs.net/sergun/archive/2009/07/01/windows-7-sensor-and-location-platform-sensors-programming-part-23.aspx 

Part III:
http://geekswithblogs.net/sergun/archive/2009/07/02/windows-7-sensor-and-location-platform-implementation-of-own-sensor.aspx