the real problem will be hordes of people in the streets shouting "OK Glass, do *blah*"
Yeah that's the future right there!
I was thinking for flying that you would use it for information purposes related to flying but I suppose it could be used for stupid distracting stuff as well. I don't think it would be a problem displaying still information, but moving stuff would most certainly be distracting. It's easy to move your head if you need to look where the screen is, much like you would with glasses frames.