I always loved how Americans call bags, "sacks" as in we are taking a trip and having a sack lunch...too cool!

Thats really funny... sack lunch. I've always said bag lunch... and I grew up and live in Maryland... I wonder if its regional.

Then there is the old "zee" versus "zed" thing

Hmm again. I've never heard people around here say "zed". How would you say, oh, yeah, the new Nissan 350 Zed.

The think I wish they tought in my elementary school - putting that little notch in the 'Z' and to a lesser extent, the numeral 7. Its easier to distinguish a handwritten 'Z' from a 2 if the Z has that little mark. Same for 0 and O. That is the worst when you're trying to enter a product key and there are a lot of O's and Zeros, and they don't slash the zero.