See it in action! http://heatmap.the.tl See a video demo: http://www.youtube.com/watch?v=9c2jF7hBvVM Uses Google Maps and Flex All client side. *See index.html for an example.* Run http.py and then go to http://localhost. Works in all main browsers and IE8. Special thanks to Michael VanDaniker for the code to for the heatmaps in Flex. http://michaelvandaniker.com/blog/2008/07/06/how-to-make-heat-maps-in-flex/ Also thanks to Chad W. L. Whitacre. His documentation of gheat (http://code.google.com/p/gheat/) helped me with this. Also thanks to the Google Maps v3 api for the documentation and demo for Overlays and the Mercator Projection code http://code.google.com/apis/maps/documentation/javascript/overlays.html#TileCoordinates http://code.google.com/apis/maps/documentation/javascript/examples/map-coordinates.html ==TODO== modify the not-so-good canvas implementation with this one http://www.patrick-wied.at/static/heatmap/