I know there is a VW iPod adapter, I didn't price it or look into it too much. I would be a little skeptical of the interface when navigating around the iPod though. The Alpine is by no means perfect, but it's pretty damn good and more or less the same style navigation as the iPod itself.

And now I can play burnt CD's, mp3 CD's and have a decent platform if I wanted to upgrade speakers, etc.