João Paulo Figueira @ Native Mobile has released is long waited code for interacting with the bluetooth device on you WM:

"When I wrote my first article on the Widcomm Bluetooth stack, I promised to publish a .NET CF 2.0 library that would abstract the enumeration features of the Widcomm and Microsoft stacks under a unique API. My life became very busy since then, especially when I got a contract for integrating the new version of a mobile GPS application on the Windows Mobile environment. This has been a very interesting challenge that has put all my knowledge through its paces and made me learn a lot: powering off the device, integrating DirectDraw with screen rotations, popping up the phone when a call comes through and the screen is in DirectDraw mode, handling bizzare GPS behaviors, exotic device keys (think HTC 3300)... The works!

Requests for the Bluetooth code and article have not stopped, though so I decided to post links to the unedited versions of the C++ and C# sources. Before I get to fully comment the code and write a proper article, what you see is what you get. The sources are divided into 3 ZIP files:

Bluetooth.zip - Contains a sample C# WM5 application that enumerates devices and services. Also contains the Primeworks.Bluetooth class library.
msbts.zip - The low-level Microsoft Bluetooth stack wrapper.
wcbts.zip - The low-level Widcomm Bluetooth stack wrapper.

Now, I can take my time and write the full length article. All your comments and suggestions are welcome."

[Via The Bluetooth sources]