I can honestly say, thank goodness someone did the research to figure this out. This is a map of which regions of the country generally say 'soda', 'pop' or 'coke' when ordering a soft drink.
This question was quite the hot topic during my first week of college -- and now we have the data! I confess, coming from a strong soda county, I grew up thinking that "pop" was primarily an old-fashioned term from the '50s and earlier -- i.e. I take my baby down to the corner and I buy him a (soda) pop. Apparently, I was very wrong - we're badly outnumbered. The map also clearly shows the nefarious regional influence of the Atlanta-based Coca-Cola company.
Anyway, the map comes courtesy of mapsforus.org, and their hilariously inarticulate spokesperson.
In a somewhat different vein, this map is pretty interesting too (provided you buy their methodology). Perhaps someone should write a memo to the Democrats.