I do have a MP3-Bluetooth headunit - kenwood excelon kdc-x695
I use to sync my TP2 to its bluetooth, but it will only do "voice" so I can not stream data to the headunit. The head unit also has a line-in and USB port. I also have a sansa fuze that I hook up that way... so TP2 might not be much of a "media player" for me in that sense.
I doubt I will be doing much "cab testing" but it's good to know for whatever may come.
I will probably keep sharkieROM - if I ever travel internationally, I can consider this for international GSM use right?
The photon4g that I purchased is an international phone too for that reason, when the need would ever arise.
Thanks for the ideas - would love to hear some more uses after losing voice/data on it.