World travelers and students of world affairs should like this Google mashup, "If It Were My Home". Compare country size and statistics for USA vs Afghanistan, Argentina, or any country in the world. If you love visuals, this is a good way to look at comparison statistics.
The site also helps you visualize disasters like the 2010 Pakistan flood or the BP oil spill.
The site was designed by Annette Calabrese and developed by Andy Lintner.