Blitzsafe makes a kit to convert your trunk mounted cd changer for iPod for about $59.

Leave a lil bit of slack on the cassette adapter wire inside your radio so the cassette can pop out enough for the radio to play.

I hate the wire that hangs out of my factory stereo from my cassette adapter to connect my iPod. So I turned the cassette adapter upside down (side B), feed the wire through the cassette slot, out the back of the stereo and down the center console. No more wire hanging out!