I just wanted to come drop this link
http://kwc.org/mythbusters/2006/04/e..._on_plane.html
As others have stated before, the cell phone rule is purely Security Theatre. There is nothing your cell phone can do to the plane, and ereaders, especially ones WITHOUT transmitting technology are completely harmless. It's a stupid rule to give the flight attendants something to do, and make you feel "safe".