I though this was interesting. Crutchfield has a little wizard that lets you input your iPod and car stereo and what the best solution is for connecting the two (with a product that Crutchfield sells, no doubt).
But I didn’t realize my car stereo actually had an auxillary input on the back. So it was helpful at least.
http://www.crutchfield.com/S-sWjC20J9dBr/cgi-bin/tools/DigitalDriveThru/DigitalDriveThruintro.asp
