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This is a great idea, and I can well imagine using it.

But the Google Maps integration seems a bit shaky at present -- the overlay generally fails to refresh when I scroll the map (FF 4.0.1 on Mac).

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I enhanced Sunng's googlemap page by adding google map event and event listener. Here you can see the live demo. http://nihuajie.com/heatmap/googlemap.html

There are some redraw issue on panning the map. It seems that GoogleMaps won't redraw unless the panning distance is large enough. I will try to smooth it in future release.

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