ChipChick has recently reviewed the Kensington LiquidAUX Deluxe for iPhone and iPod mobile auxiliary car kit, and here's what she has to say about it.
The LiquidAUX Deluxe for iPhone and iPod is a breath of fresh air away from FM Transmitters. If your car has an Auxiliary port, there is no reason to get an FM transmitter anymore. The LiquidAUX iPhone and iPod costs almost as much as a comparable FM transmitter but produces a better audio experience and is less of a hassle to operate. The inclusion of the detachable remote with steering wheel mount make the LiquidAUX Deluxe convenient, safe and a pleasure to use. The LiquidAUX Deluxe for iPhone and iPod retails for $99.99, comes with a 2 year warranty and is compatible with the 1st, 2nd, and 3rd gen Nanos, the 4th and 5th gen iPods, the iPod Classic, the iPod Touch and the iPhone.
If you haven't yet gotten an FM transmitter - good. There is no need for such a device with the Kensington LiquidAUX Deluxe.