Proof of concept: http://brfss-map.hankyates.com/
As an exercise I wanted to build a Chloropleth map. Well I didn't exactly start at wanting to build a chloropleth map. It started as a simple question, which Parishes in Louisiana could use more resources in improving the overall health of their population? I wanted to see which parishes had the most smokers. Which had the most drinkers. Which had the most people who smoked AND drank.
The CDC runs a telephone survey called the Behavioral Risk Factor Surveillance System and publishes the results of the data. After quite a bit of normalization of the data (which could be it's own blog post), I managed to mash up a quick proof of concept.