Not sure if you're just looking to make music or if you're looking for best sound.
If you just want to make music, all you need is a cheap Radio Shack cable with 1/8 inch (I believe, whatever size fits in iPod) headphone on one end and double RCAs on the other. RCAs plug into any input (except phono) of your receiver or preamp. Headphone jack can go into the headphone out of the iPod or the audio out of the dock if you have one.
For best sound, listen to the other guys who posted before me.
If you just want to make music, all you need is a cheap Radio Shack cable with 1/8 inch (I believe, whatever size fits in iPod) headphone on one end and double RCAs on the other. RCAs plug into any input (except phono) of your receiver or preamp. Headphone jack can go into the headphone out of the iPod or the audio out of the dock if you have one.
For best sound, listen to the other guys who posted before me.