The Senator said:
what is the best way to plug your ipod to your car stereo??
The BEST way is to have a radio head unit with an iPod interface, where you can have your iPod connected via a lead in the glovebox, so that the iPod is being charged as well as providing a data feed, and is controlled via the radio controls on the steering wheel.
Means you probably have to change your radio, but you did ask what the best way was.
I have a Clarion head unit that does all this, and there are others -- Alpine, JVC, Blaupunkt for example.
In my other car I have a lead plugged into the Aux socket on the back of the (Sony) radio. Works OK, but of course does not charge the iPod, and you have to control it from the iPod itself, which can be distracting while driving.