Anyone ever heard of some type of reverse ipod adapter. I've been thinking about how it would be great for carpc's in cars with ipod interfaces. It would hook up to the ipod interface on one end and go to the pc on the other end for controlling a media app. It's probably something I should post on mp3car.com. I know car2pc.com makes interfaces to control, but they only have a limited list of vehicles they work with. I figured this would end up being a little more universal. I dunno, I get bored at work quite a bit so I end up thinking of all kinds of crap like this.

I'm kind of confused as to what you're asking. Why would you want to connect it twice? If something is using the 'interface' such as a CD deck with ipod controls, it pretty much disables everything on the ipod. I cannot think of a situation on why you'd want to connect it twice basically.

no use the ipod connection capabilites to use a deck to control a pc instead of an ipod, like some type of reverse adapter

Not going to happen dude, not nearly that simple.