Why haven't we seen Portable Raspberry devices yet, then (I know people have posted howtos about making your own, but I've not seen a commercial product offering a Raspberry xx with touchscreen, battery and reasonable [12 hour minimum] battery life). I don't see the Pi Zero as a real game-changer, because the older Raspberry devices are already cheap relative to adding a good touchscreen and battery. I've heard that all the Raspberries just suck too much power to make a decent portable device. Am I wrong about that? Also, 512MB of RAM just isn't enough of an upgrade from the n900 to be very attractive.