Moving in a America

http://www.forbes.com/2010/06/04/migration-moving-wealthy-interactive-counties-map.html

From Forbes.com:

More than 10 million Americans moved from one county to another during 2008. The map below visualizes those moves. Click on any county to see comings and goings: black lines indicate net inward movement, red lines net outward movement.

2008 stats.