You mean the jack underneath the armrest? To use your ipod with it, just get a 3.5 mm audio cable (male both sides) and connect it to your IPod. Press DISC/AUX and that's it.
Thanks, I knew it would be easy! I take it though that I can't control the iPod via the Media pack, if I want to skip tracks I guess I would need to do it via the iPod itself, yeah?