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What would be an equally interesting map is a heat map of correlation coefficients between income and obesity. I'll bet it would look almost exactly like the map of obesity, but there might be some interesting pockets that could show where rich people might be fat or poor people might be fit. We could learn something from those data, I think. veen why don't you build that? :) The data must be out there in a relatively usable form somewhere.
That would be interesting, and I think I could totally build that (the data used to make the map is downloadable from the site, and I can get my hands on economic data) - if I didn't have licensing issues with the ArcGIS software package. I'm waiting for support staff to get back to me.