Statistical Map

http://seattlebubble.com/blog/2006/09/11/mapping-housing-market-health/

This map shows the difference in inflation adjusted median household income from 1999 to 2005. The dark blue colors represent +10% & above which only represents North Dakota. The middle range is represented by a light blue color and a cream color that represent the majority of the states.  The darker orange color represents -10% & below which represent 5 states on the eastern side of the country. The majority of the states on the western side of the country fall in somewhere in the middle of the chart. This map is very easy to read, however I wish they would have used more colors rather than shades of the same color because it can be hard to indicate in small areas.