if you guys don't mind rebates. you can get a Belkin Ipod mini/nano car charger / FM transmitter for FREE after a $30 rebate.

Link

$30 rebate link
This thing is normally $74.99. If you use google checkout (your gmail email account) you get an additional $20 off $50 purchase on top of the $30 rebate. Buy.com also offers free shipping on this thing. Great for any Ipod Mino and 1st gen Ipod Nano.

If you have a 2nd Gen Ipod Nano you can get a free belkin adapter form their website (although it looks like it only comes in black):

link