I bought an iMount unit that attaches to the cigarette lighter. It holds and charges your iPod. It also holds my iPod with iTrip (FM transmitter) in a perfect position for great transmission. I just keep the radio preset to 87.9 and I'm good to go. I still control the volume with the steering wheel controls. The sound quality is as good as a wired input.
The iMount is NOT a good 911 solution. The cigarette lighter is too recessed under the dash lip. For the 911, I have this little no-slip pad made of some gummy soft material that grips the dash and the iPod really well. I take corners pretty quick and it hasn't budged. Again, keeping the iTrip so close to the antenna gives great reception.