Paul,
Just so you know, when I was at primary school, we learned the alphabet song... complete with "zed".
Mind you, we also used to get Sesame Street on television here, so I was aware that it sounded a little... odd. Even to my wonderfully British ears.
Aurora: thank you for your post! Very educational. I didn't know half of that stuff; for me, I learned to say "zed" because that's how we do things over here. I'm delighted to know that there is a better reason.
Chris (who must go outside. The sun is out for the first time in days, and the light level (at midday) has got beyond twilight.)
Chris