ExSimGuy was asking about CD players...
Seems to me that different airlines have different policies on passenger use of electronic gizmos - especially CD players.
Quite a few airlines ban CD players (but who's really checking if your laptop has a CD-ROM drive in it?) on the basis - I believe - that the read electronics can generate some nasty little pulses.
A few months back I spoke to a guy who was responsible for defining the relevant safety policy in his airline (no names, no scandal), and his comment was that they decided to ban CD players just to be extra-extra-extra-safe rather than because there was any specific evidence of a danger.
It's easy to see how mobile phones can play tricks on the avionics (and the posts here prove it), but does anyone really have any experience of similar glitches due to use of CD players?
(Incidentally, I've lost count of the times I've seen pax making mobile phone calls while sitting in their seats waiting for pushback. Hope the effects on the nav equipment that Kaptin M mentioned earlier are easy for the flight crew to spot.)