" ... The new gadget feature of Google Spreadsheets makes it easy to add heat maps. This can be used to create a world map illustrating the Googleshare for a given keyword across different countries; now-Google employee Douwe Osinga called this "Land Geist" a couple of years ago ... "
Wednesday, April 02, 2008
Google Geographic Heatmaps
Based on this I will go back and take another look at Google Spreadsheets: