I'm releasing my BlueTracker application which tracks bluetooth devices and issues updates over xPL. It currently works with only the Microsoft BT stack, but you can hack your BT dongle to use the Microsoft stack. I don't have any Widcomm devices so it doesn't have any support for that driver - but it should be easy enough to add when the 32 Feet.NET SDK is released with Widcomm support (It's in Beta currently). You can read my previous posts on BlueTracker to get an idea how it works. Grab it.