@Laughing Man, well, you'd have to wait for it to boot up, which i would expect would take longer than your car to start. I'd suggest maximuscool's train of thought. Keep it on, with no widgets/apps running, and just set a dbus controlled command to enable/disable fm transmitter depending on wether its charging or not. It should automatically recharge the battery when the car is running.

as for the topic. I'm hesitant to make the jump to Android until the Meego device is out. I'd rather wait and see, and fork out for a top end model later only if i have to make that move.