I have just finished fitting my TTG 300 in my glovebox with the permanent docking kit so I thought I would share the pic.
For those that don't know the car kit does the following:
Direct power charging from your car battery (12V).
TomTom GO switches on/off with your car ignition.
Very clear voice instructions over your car stereo.
The car stereo will mute for the TomTom GO voice instructions.
Day/night view of your TomTom GO can be set to switch on and off automatically with the headlights.