The KML Factbook is a great tool for creating mapped displays of all manner of demographic, economic, and political data.
To show you the power of this application I have chosen to look at population.
You can view the information on a Google map.
When you click on a country a comparison chart will pop up.
You can also view the information in a KML file. (Google Earth) The file will open in Google Earth if it is installed.
There are numerous data sets available and it is relatively easy to create one of your own. I could see this as a possible High School project.