Or you could do some circuit wizardry and use the car's on-board computer (assuming it has one of course) to do your bidding. Mind you, it will probably crash (literally, into a tree) if you try and install Vista, but XP should be OK. You'll get more MPG with XP anyway
Then just install LFS (don't ask where, I haven't a clue), and hook up the computer console (again, I'm assuming it has a centre console) to the computer. Voila, properly built in LFS, and the abilitly to use MSN while you drive. Also there's currently no laws about using a keyboard while driving, so you would still be perfectly legal. Epic win.