Airlines don't let you use electronic devices when the plane is taking off/landing. Let's suppose I have a Kindle 3, and I have turned off wireless (i.e. both Wifi and GSM/3G is off).
Since you don't need power or the battery to read what's on the screen (the magic of eInk displays), it's technically 'off' when I'm reading it, right?
Can I still use it when the flight is taking off? Have any national aviation authorities passed judgement on this?