I don't have an iPod even tho' I have at least 3 Macs at any given moment..but many of you guys seem to have the iPod. One of my Mac news services had a decent review of a simple device you plug in your cigar lighter and it FM's an iPod into your car stereo. Here's the link:
http://www.tidbits.com/tb-issues/TidBITS-775.html#lnk6
Look for: "An FM Transmitting Monster".
jim