I am really enjoying the seamless functionality that I get when using my iPhone as both an MP3 player and phone in the car. If I get a call, it automatically fades and pauses the music, rings through the speaker system, and routes the call into my Apple bluetooth headset. When I'm done it automagically fades the music back up just where I left off.
So, today, I got bored. Really, really, really bored. I have an extra iPhone dock and decided to stick it in my ashtray just because, well, I can.
A few hours and lots of tools, epoxy, and fiberglass later my project was done, the ashtray was never touched, and I am enjoying my little phone/MP3 setup even more!
click for pictures