You can buy a thingymajig that connects to your iPod and then acts as a radio transmitter - then just tune your radio in to the FM frequency that the transmitter broadcasts at, and you're using your iPod in the car!
Comments regarding running in greatly appreciated - am awaiting my brand new Ed30 (should be arriving beginning of March - ordered it in November so you can imagine I'm a bit desparate by now!) I've gone a bit silly with the options so the extra 30bhp should come in useful ...
Cheers
Hi - good luck with the Edition 30! Not too long now

We used to have an ipod radio transmitter - it was called 'itrip'. It was rubbish.

The sound quality was poor at the best of times - its signal was so weak that the radio didn't pick it up very well unless you wedged it into the glove box in a certain way, and trying to find a band without interference from radio stations was nigh on impossible. You think you'd found one, then travel 100 miles up the road and it would start getting interference again.
Add to that the fact that it doesn't charge up your ipod so half the time it switches off because the battery's flat, all I can say is steer clear! Nothing beats a bit of copper between the devices. (Haven't tried bluetooth either, but really, what a lot of faff that stuff ends up being)