Alpine just announced an AI Net controller for iPODs....so anyone of their unit will soon be able to control it directly.....which makes me wonder if its just reading the HD or truly interfacing with the iPOD's controls.....i have a 2.5 HD sitting around in an external enclosure....would be sweet to hook it up to my head unit
also, many companies offer aux inputs.....AIWA has a mini plug input on their head units (although i would never buy an aiwa head unit)
Alpine again, offers an AI Net unit to hook up RCA connections, which will also work with your iPOD
so it all depends on your budget.....
puv