Mapping Worlds has created two sites for the USA and the world with animated cartograms, maps where the value of a parameter is used to adjust the drawn size of a geographic area. Here’s an animated cartogram showing military spending for world countries; click on the clockwise circular arrow on the map to have the countries resized based on their military expenditures:
Click on the Resize button (the counter-clockwise circular arrow at the upper left) to reset the countries to their original size. Repeat at will.
Data can be very timely; here’s a USA cartogram showing stimulus bill jobs by state: