The Washington Post has posted a clickable county map of the United States, illustrating the percentage of households in the top 5% of national income (based on data from the US Census Bureau).
A map and discussion of those areas of the US in which grocery stores outnumber bars. In which the regional number of bars per capita is arrived at, and outliers found. A boring person would conclude that these numbers are inversely correlated with population density. A more obviously correct conclusion, of course, is that the Midwest knows how to get down.
Job Voyager: a data visualization tool for US occupations as a percentage of the labor pool, 1850-2000. (Stream graphs previously)