This morning I came upon an RSS feed through Joe Mako and Clearly and Simply which is a brilliant work around to the lack of truly flexible choropleth map capability in Tableau. While Tableau does do some choropleth mapping of US Census data at the State, County, Zipcode and Area Code levels, what if your data needs are more granular than that. Or, perhaps your interested in some other dimensional data that you want to display with greater granularity using a Tableau visualization.
There are sample Tableau workbooks posted on Clearly and Simply.
Really clever work.