I bought a JVC deck and one of these adapters to conect for ipod. It keeps the ipod charged and allows for its controls to be done through the deck, not the ipod itself. It simply plugs in the back of the deck like a cd changer would, with the other end coming through your glovebox (or wherever you want it).
I got a great deal on boxing day where I saved $160 on the deck plus got the ipod adapter for free. Future shop lists this at $100 but I've seen them on sale for half that. You may even get them cheaper if you shop online/ebay.
http://www.futureshop.ca/catalog/pro...96&catid=22560