StreetDeck is more than just GPS NAVIGATION software
StreetDeck is Microsoft Windows based software that uses the latest technology to take advantage of all the power in your UMPC, Laptop, NetBook, or other in car PC.
GPS Navigation, Music, Satellite Radio, HD Radio, and More. It makes the features you want to use in your car accessible while driving.

Volkswagen Electronic Research Labs in Palo Alto, CA have used StreetDeck for a number of internal research projects on thier Intel powered car computers. Check out C-Net's review of the GLORIA head unit running StreetDeck with a custom skin and custom addins.
[Via Engadget Via CNET]