This is a really nice flickr photo set that describes how to hack you car stereo. It seems like everyone has an MP3 player, but not everyone has an AUX input in his or her car.
After having two newer radios stolen from my car, my dad was nice enough to send me the original factory one. The idea is, no one in their right mind would steal this thing. The only problem is that it doesn’t have an AUX input- how am I to hook up a music player to it? Tape adapters and FM broadcasting devices aren’t a great solution, so I decided to put one in myself.
Read more about How to: AUX input in a factory radio