Following on the last post, another link from Neal at Literal-Minded: Interactive map showing the frequency, by state, of search terms on Allrecipes.com in the days leading up to Thanksgiving. Regional variation in menus (why don't the Dakotas like "green bean casserole"?!? how many people in Idaho did it take to push "butternut squash" over the tipping point?) and sometimes in vocabulary (check out "yam" vs. "sweet potato") are obvious and interesting.
Careful in your interpretation, though. There are, for example, comparatively few searches for "pie crust" in the South. My assumption (totally stereotype-based) is that this is not because Southerners don't eat pie at Thanksgiving, but more likely because Southerners know how to make pie crust. Or maybe if they don't know how to make it, they buy refrigerated pie crust. I think I know someone who could probably tell me the answer to that one.
If, like me, you grew up in one region of the country and now live in a different one, you may find the results especially relevant.