Were you hoping to connect your iPhone to the aux input of your car stereo? If so, I went to Radio Shack and picked up a Monster cable. The cable has two standard connectors. I put one connector into the aux input, and the other to my iPhone via Seidio adapter.
Yeah, i'm picking up my new TSX tomorrow and it has a mini-phono aux in. I will primarily use my old iPod mini as the music device and a regular mini to mini will work fine. I will use the iPhone for podcasts since I sync/charge that daily and this requires some kind adapter. I guess I could shave a regular connector but I was hoping for something more 'elegant'
I may get a USA spec adapter so I can take the audio out of the bottom of the ipod and then control the iPod functions from the steering wheel controls, but that is later.