I agree that counting back change is a skill that is often over looked. I'm 31 and it drives me nuts when they have to rely on the coputer to count back change.
One area I'm on the fence about is calculator use. I feel they should be able to do basic math without one, but now-a-days all businesses are using computers for everything, and we an all atest the younger they start using them the better they are at using them!
Just my two cents!