Dim red is few hits, bright yellow is lots of hits. I didn't filter out search engines, so there are definitely some spurious robotic yellow yanks in there.
(But things must be /really/ boring in Coober Pedy...)
Technically it's all very simple; the free (in the beer-sense) GeoIP city database tells me where you fellows are (lat+lon from your ip address), the map comes from NASA's beautiful "Blue Marble" data sets and the glue code is mine.
