Gizmodo linked to an article by Guy Kewney that asks if cell phone are really as dangerous on airliners as the airlines say. An interesting read, let's hope an aerospace nerd reads and can fill him in.
"Can a mobile phone really cause a fly-by-wire computer-controlled aircraft to fall out of the sky? And if I switch on a Centrino-based PC, or a Pocket PC Phone edition, am I risking my life and those of my fellow passengers?"