Ive got a mini PDA and Tomtom. I used it when i went on holiday and it was perfect! Ive run a cable from the top of my dash down to my MP3 player that is hooked up to the gamma unit and all the instructions come through the car radio As well as phone calls etc
I've got Orange SPV500 (Imate Sp3) with TomTom Mobile SD card (50 off ebay) and a Tom Tom Bluetooth GPS receiver (80 ebay). Works a treat and Traffic really is superb and worth the money.