I've got a cable you can have for free. I bought one off eBay for about £6, it works but it's not great, it's too quiet and I found I needed to tun the volume up quite high to get a reasonable sound out of it. I then bought A DENSION unit (About £80), it's better in that it charges the Ipod as well and the sound is louder than the aux and you can skip forwards and backwards using stereo controls but can't say I'm overly impressed, still a bit quiet but functional.
If you want the cable send me a PM but you might have to wait a week or two before I can get to Post Office,
