My new car has a line in connector for attaching external audio players to the HiFi system which I tried to with my BlackBerry Bold. Playing music from my 8GB microSD card worked well but I had the problem that calls were not redirected to my built in Bluetooth hands free equipment anymore. It seems that the BlackBerry identifies the line in cable wrongly as a headset.

So I decided to give the BlackBerry Bluetooth Stereo Gateway a try:

I tried it now for about a week and I learned the following: While the first couple of test drives my BlackBerry Bold rebooted unexpectedly after playing music for some minutes. I thought it could be a problem if I connect the device to two Bluetooth devices (the handsfree set and the stereo gateway) but I found out that it had something to do with the volume. If I set the BlackBerry to maximum volume the reboots happened, if I turned down the volume a little bit I was able to listen to the music for hours.

I am happy with this setup now, no more cable salad in my car.