BT Audio

BT Audio is a shareware Windows Mobile application that enables the use of ordinary Bluetooth headsets for listening to audio such as Media Player streams, Audible eBooks, TomTom Navigator, NES emulators, and many more.

The downloadable free version has two limitations:

1. Any incoming phone call will “interrupt” the Bluetooth stream this application opens. After your phone call ends, you will have to return to this application and re-enable the audio. The “full” version of the application removes this limitation.
   The application will only run for 30 minutes at a time. After 30 minutes, it will exit automatically, and you will have to re-start it manually.
   

If you require a “fully hands-free” version of the program which will automatically re-enable itself after a phone call, you can buy BTAudio right here for $20 USD.

Note that this application requires .NET Compact Framework 2.0