I came across this cool application (here)this morning which allows visualization of geo-data. The images below show the spread of Walmart Store openings in the US over the last 45 years. SpacialKey is in Beta at the moment – Sign up and maybe they’ll let you feed in some of your own data 
Plotted using concentric circles (# Walmart Stores)
Heatmap version of Walmart store openings
From what I read on the BrightKite (here) blog see SpacialKey may be implemented with Brightkite (here) the location based social networking tool.
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Real nice post!
the software looks very easy and clean to use.
have you tested it already?
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