I purchased the Pioneer CD-IB100II iPod adapter today from Image Audio for my Pioneer DEH-4800MP car stereo.  I had only used the thing for a total of 10 seconds when I decided I absolutely *hated* how it operates.  I very much disliked the fact that I had to use my stereo to control which song/podcast was being played.  It wouldn't have been so bad that I was forced to use the stereo to control which song was being played, except that when scrolling through the songs, it plays them.

  This is really bad for podcasts.  Playing a podcast marks it as not-new and makes it hard to figure out which ones need to be listened to.

  I was talking to a friend of mine while installing the unit, and he looked on the interweb and turns out that I'm not the only one with this complaint.  Well, some enterprising fellow out there figured out that if you take apart the iPod adapter and snip the blue wire that goes out to the iPod (or in my case I disconnected the from the connector and e-taped it), you get all the benefits of the iPod adapter (charging and line-level outputs) with none of the draw-backs (crappy interface).  So now I can control what song is being played on iPod and not the adapter!

  There is one drawback to disconnecting the blue wire...  The stereo now displays "ERROR-11" a minute or two after power on.  The error message is no big deal, the audio from the iPod still plays and can be heard through the car stereo, iPod still charges, and I get to use the nice iPod interface!