i don't know where all it is available but verizon offers wireless internet with claimed average speeds in the 300-500kbps(iirc) range. i cannot think of a reason why i would need a computer in my car when i have my laptop but as soon as i can justify this i may well build one. great idea you had

00 black/tan svt, #2052 of 2150, born 2/1/00 formerly known as my csvt "Nothing in the world is more dangerous than a sincere ignorance and conscientious stupidity." -Martin Luther King, Jr.