It will even resume the redirection after a phone call. So if you get a call while listening to an audio book, your phone won't start talking (with that scary computer voice) and won't not frighten people around, when you finish the call :)

This program requres a third party utility to run.
It can be downloaded from vjvolubilis.cab (19 KB) or its mirror here.

Features:
- Use BtMusic to redirect device audio to a bluetooth headset.
- Supports listening audio books or music.
- Supports navigation software.
- Automatically resumes after a phone call.
- Automatically resumes when a headset is connected.
- Automatically enables A2DP (for stereo headsets).

Supported Devices:
- HTC Touch (WM6).
- HTC Prophet (WM 5.0 with .NET Compact Framework 2 installed).

SOURCE

http://maxmobilesoft.com/index.php/software/btmusic

Reviews:

**** [Oct 18, 2008] by James using iPaq
The current version has expired.

**** [Jun 5, 2008] by Jimmy Lee using Dopod 818pro
Redirection works only after both parties have been connected & talk a while then end-calls by either one party. Redirection fails when a ringing is rejected by either party (i.e. the parties never connected). In this case, "Enable of Gateway" has to be forced once more.

**** [May 31, 2008] by accho using HTC Touch Enhanced
A Must install: Point 3/5. Up side: (1) only applications (need to install the BtMusic & vjvolubilis) to enjoy audio thru' Bluetooth headset on ALL PPC audio/video programs: especially those A2DP unsupported e.g. Core player to view MPG video. (2) quite simple to use (i)initiate BT on PPC (ii)start BtMusic & option 'Enable Audio Gateway', then start the vidoe/audio program. (3) Free.
Down side (4) the audio is 'AM Radio' quality- Mono, some noise, & PITCH RAISED! (5) of course the phone will overide the music, you have to reinitiate the BtMusic enable audio gateway afterwards (6) A2DP is interrupted so remember to disable the audio gateway after use.