G'day Scott,
I have for a very long time loved this page:
http://www.popvssoda.com/
It has a map showing the geographic distribution of pop vs soda vs coke
vs. other (usually soft drink).
That map of the world seems smaller than it ought to be (it's missing
the bits on the edges that most maps of its kind mark "here be dragons").
As I understand it the contentiousness of these different terms is
almost exclusive to American English. At least that what [[Soft drink]]
seems to indicate.
Dalf