The kmlfactbook.org site can create impressive presentations from global data-sets. The site allows you to create Google Earth kml files from your own custom data and view the results in Google Maps, via the Google Earth plug-in or download the kml and view it in Google Earth.
As well as allowing anyone to create presentations built with their own data the site has a wealth of data to view from the World Resources Institute EarthTrends and from the CIA Factbook.
The left part of the screen is used to list and select the submitted data-sets. Once a data-set is selected the data is loaded onto a Google Map. You can also choose to view the data in the Google Earth plug-in or opt to download the kml.