I know, I know, you were jealous of Europe and especially its Toyota Yaris with dockable TomTom GPS navigation head unit. You can breath a sigh of relief because Eclipse has taken that idea and made it available for anybody! Hooray!
The Eclipse AVN2210p MK II allows for a TomTom GPS navigation unit to dock in and out of the head unit. This is extra-convenient for regular swapping of cars and for those that like to do a little walking with a GPS unit. The unit also includes a CD player with MP3 support, Bluetooth and more. It's available from Crutchfield for $600. [Crutchfield via Uncrate]