Belkin TuneBase (F8Z441ea) FM Transmitter for iPod / iPhone with Hands Free
Charge and Listen to your iPod or iPhone through your cars sound system
Connects wirelessly to your car radio by finding a clear FM station using ClearScan Technology
Hassle Free Set-up with adjustable cradle which is case compatible
Embedded Microphone allows for Safe Handsfree calling
Single Push button to control music playback and to receive / end calls
Supported Devices: All iPhone's/iPod's except iPod Shuffle. To use all of the features you need to be using an iPhone
Warranty Period: Limited 3 Year Warranty
Package Contents: TuneBase FM, Fit Ring, Cushion for iPod Nano
Rings up as £51.12 but use voucher code 'TUNEBASE' to get £10 off at the check out stage. Voucher valid until 16th Aug 2009.
It seems to get good reviews and I'm thinking about getting one myself.
Hope it helps.