Thanks! I appreciate the positive vibes. My favorite trick I learned was how to use the GDAL tools (ogr2ogr) plus Topojson to fetch the data (the geometry plus the sales db exposed on the arcGis REST endpoint) and convert it to geoJSON in order to deal with it via D3. Pretty rewarding to finally get something to project properly after spending roughly eleventeen hours trial and erroring on the command line with those (very powerful) tools...

It was super fun to make. Thanks for checking it out.