Interesting use of a Bar-Mekko

Ya gotta love Twitter.  Our CEO came across this blog post through a TweetBeep Alert on the word "Mekko". It's a bar-mekko chart (sometimes referred to as a variwide chart) of U.S. CO2 emissions by state.

http://tomschulz.name/2009/us-co2-emissions/

Here's the chart on SlideShare.

U.S. CO2 Emissions by State, both total and per capita (2007)

Note that the width is population and the height represents CO2 emissions per capita. So, do you have a great use of a Bar-Mekko?  I'd love to see it!