I saw this survey a long time ago.
It breaks down pronunciation and word choice among areas of the country and uses dots on the map to show where different people say different things.
For example, the big one:
What is your generic term for a sweetened carbonated beverage?
Most people in the northeast and west say "soda," Most people in the Great Lakes region say "pop," and most people in the south say "Coke."
I say soda, as do most people in Southern Illinois, where I grew up, although both pop and coke have a little influence in the region.
I also like this one:
What do you call the activity of driving around in circles in a car?
Most people call it "doing donuts," of course, but people in Minnesota seem to call it "whipping shitties."