The suction cup mount is the most universal option. Other options may be more limited by the car. For example, a cigarette light mount in Golf would be tough as it is tucked in a an awkward location that works for a charger, but tough on a mount.
To the last post, there is still no announced price.
And for iPod users, I found an interesting post on Gizmodo about using the car kit with an iPod touch:
http://gizmodo.com/5339070/confirmed...ird-party-apps
Good news: According to Yann Lafargue, PR guy at TomTom, the incoming TomTom GPS Car Kit will work with the iPod touch, enabling full GPS capabilities in Apple's smart multimedia player:Oui, je confirme et il fonctionnera avec un iPod Touch ou d'autres logiciels de navigations concurrents. Pour la disponibilité, je ne peux pas répondre.
It will work with the iPod touch and other competing GPS (iPhone OS) software. I can't comment on availability.
In other words, the car kit contains a full GPS, which apparently will not only work with the iPod touch, but also replace the iPhone's GPS with a faster, more accurate unit.