This deal has ended.
Buy.com has the Kensington iPod Charger & FM Transmitter for only $20.99 after a $15 mail-in rebate valid through 12/31 and the $20 off $50 discount you get if you pay via Google Checkout. This is $60-plus at other stores. Shipping is free and there is no sales tax (except CA, MA, MD, TN). This charges your iPod and transmits it through your car's FM radio. It is rated 4 of 5 by 35 reviewers.