Oh, nice! Here is situation: I have a pretty old car with FM receiver and single CD player, with no line input. Problem: I want to listen to the music from my iPhone, hopefully with a distraction free interface. For that I need a horrible contraption from car power splitter, USB cable to the iPhone that usually doubles as GPS on the dashboard, audio cable back to FM transmitter down there plugged into power outlet.

But now I can have a raspberry pi hidden somewhere, translating audio to FM and possibly recognizing my voice commands while at it like "play We Are the Void by Dark Tranquillity"