Its sad to say this, but the car-audio world might do some good if someone
like Microsoft tried to enter it with a CE-based plaform. (Of course, would
much prefer a linux-based platform, but even a CE-based platform similar
to an IPAQ or something like that, would be better than the road we are going
down today)

They did already, it hasn't been a complete success...

http://www.microsoft.com/automotive/
http://www.autopc.com/
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Remind me to change my signature to something more interesting someday