SpatialKey data visualisation of Geo data

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.