Coke or Pop?
Pat had a great link on his site (thehannons.net) to a site that tracks the usage of “coke”, “pop”, or “soda”… check out the great map of county by county data, and you can also enter your preference on their site at www.popvssoda.com. Great stuff!
And if you’re really into this type of thing, there’s a link there to a Dialect Survey developed by some Harvard professors that has a lot of different pronunciation and term comparisons.