Andy, by the head unit. The dock just stores the ipod securely and out of the way. You still need a headunit that is ipod ready (and interface if necessary). I just thought it was cool since you just slide the ipod in and go...no pouches, connectors or anything else to deal with.
MB Quart's 08 stuff looks pretty good (and reasonably priced)....wish I had waited another year. Glad the mfgs are realizing the market potential.