I have an iPhone 4 (and have pre-ordered a 4S] and I have a car. I'd like to play the music from my phone over the car's speakers easily. I know I can get a cord that has a cigarette lighter adapter on one end and a 3.5mm audio jack on the other but I'd prefer to do it completely wireless if possible.
Has anyone had any success doing this? If so what device(s) did you use?