I have been asked by a few people to share on how to listen to their iPod through their car stereo system. There are a few methods of doing this. The most common is connecting your iPod to an FM transmitter and listening to your iPod via the radio. There are 2 products that I am familiar with that do this. The iTrip by Griffin Technology was one of the first. They have since come out with several versions, including one that supports the Nano. The iTrip sells for about $30 US.
The unit that I use is the Sonnet PodFreq. I was told it had a stronger transmitter. I like 2 things about this unit. First, the signal strenght is excellent. I have never had to search for multiple channels to get this to work. Even if you get into an area, where there is a lot of signal cross over, you can extend the antenna and get a stronger connection. The second reason that I chose this unit was because of their partership with Proclip USA, an auto specific bracket company. I ordered the bracket for my vehicle and now I have a permanent place to sit my iPod when I am in the car. It also comes with a charger for the iPod while it is in the car. They have a unit for the Nano. The PodFreq sells for about $100 US. Both the above units are FM transmitters. The next way of connecting your iPod is to hard wire it to your car stereo. There are 2 ways of doing this. Some car stereos today have an 3.5 mm stereo jack for aux. input. You can simply buy a cable with the 3.5 mm jack at both ends and plug one end into your iPod and the other into the jack on your stereo. The sound quality is a little better, and you don’t have to worry about FM signal reception.
The other way to hard wire your sytem into the car stereo is to buy and adapter that plugs into the CD changer plug in the back of the car stereo and connects to the iPod via the iPod dock. For sound quality, this is by far the best solution. However, you get what you pay for as this is also close to $200. The most available product I have seen is the iPod2Car from Peripheral Electronics. This system is available from BestBuy or Futureshop. Note, this installation is not for the general population.