I currently have an in-dash unit that connects to my iPod. When plugged in, the iPod itself becomes useless and just displays the logo of the head unit. The unit's controls of the iPod are sluggish to the point of being unusable. I've been forced to disconnect the iPod every time I want to make an album change or anything. Does a headunit exist that allows you to change songs or control the unit while it is plugged in? I know I could use a line-in jack, but then I lose the ability to charge the iPod (I have a GPS unit taking up my charging port). With CES here I was hoping something would come out.