There are three ways to add iPod connectivity,-
Use the Ford aux connection which just gives you a loop-through option unless like me you use a Griffin iTrip like this-
Or you add a USB converter, you then have full control of the iPod via the wheel controls but no track listings on the radio-
Or you add the full Ford Bluetooth system which requires the wiring, microphone and a Bluetooth module which is a real hassle to find cheaply and get working.
I currently have as stated an iTrip and a non standard aux cable coming out from where the lighter socket is in the cubbyhole so the cable plugs straight into the controller.
My iPod then just sits in the tray on the centre console and charges while playing, all controlled by the buttons on the iTrip.
I find it quite handy as then I can switch on mobile internet on my phone and have internet radio through the car without having to add a DAB radio or anything else like that.
The beauty of the iTrip is that it also transmits to an unused radio channel if you don't have an aux cable installed.
In my view the Ford fitted aux connection is a bit hit and miss at times but never had any problems with the one I listed above.