check out the itronix gobooks ix250. they are indestructible. just picked up two for use in my cars, magnesium case, ruggedized constuction to military specs. paid 100 bucks apiece for them. glow in the dark keys, touch screen, waterproof, can be dropped from three feet with no problems, sealed construction. there is even a video on youtube of a kid running over his gobook with his car not once but three times and no failure, ran perfectly. They even have a nifty antenna on the screen for gps/gsm service although I have no idea how to get it to work. best of all they have a great forum on yahoo which reminds me of mud, great group of people who help out fellow owners. check out ebay theres at least 20 of them listed as I type this. check them out.
