iPhone, why hast thou forsaken me!?!

.. or at the very least, my car.. So, my car has a line in, into which I have plugged a M-M mini-din extension so I can listen to my iPod in my car. Over the weekend I loaded up my iPhone with music for a little road-trip that the family took.. When I got in the car -- all excited about using my iPhone in the car -- I found out that the recess for the headphone jack is specially engineered such that a "normal" headphone plug won't fit into it. Just for giggles, today I tried plugging in my rather nice Sennheiser headphones, and sure enough -- they don't fit. Yay Apple!