Serial communication to facilitate docking

Why doesn’t Sansa offer an mp3 player with serial communcation protocols – like the :cry: IPOD ? 

All I want to be able to do is use my Sansa Clip in my Honda and control it with my factory head unit.  Currently, the only option that I have is an :cry: IPOD. 

A docking option would allow me to connect my Clip to my car, my home stereo, etc.  Right now in my home I have to use a headphone to RCA adapter – which is a hack at best.