Griffin iTrip Auto FM Transmitter + Charger with SmartScan and App Support for Apple iPod and iPhone, Black
I've had multiple iTrips from Griffin Technology, and this is my latest addition.  Not only does it work well with your iPod, iPod Touch and iPhone, but it ALSO works with (and charges) the iPad!    Now for the secret... By default, the iTrip is enabled for U.S. use, which limits the FM frequency range that it can transmit on.  However, you can enable two other modes, that allow it to transmit to a broader frequency range.  Don't try to find this info on Griffin's website.  And they won't tell you how when 