As the TomTom Go PNA devices are essentially a Linux box, why can't TomTom be made to run on a linux based PC? There are plenty of sources for the software online at the moment!
Excuse my Linux ignorance if this is a silly question Edit: But comments would be handy...
My Nissan 200SX @ Silverstone
NOW SADLY WRITTEN OFF!
My Car's spec list + pics
Stealth CarPC fab'ing...