it seems like such a simple app (i don't know how to make it though)
just something that enables the "bluetooth voicemail on" hack and also silences the external speaker.
then you could listen to music mono through your bluetooth headset
*edit just found this on another iphone forum
$49
http://oakley.com/pd/4280
they said that it also works with the motorola S9 stereo headset too.
"This adaptor will operate the itunes and phone feature on the iPhone perfectly. Once it is paired with the iPhone, attempt to make a phone call and it will ask you which one of the three (wireless headset, speakerphone, or iPhone) devices you wish to use for the phone. Simply select your wireless headset and you are set."
http://bluetoothlounge.com/reviews/m...-a2dp-adapter/