An interesting graph of moving patterns within the United States and Canada from a not-very-scientific sampling of customers of Atlas Van Lines, via Felix Salmon. (Red = balanced in-migration and out-migration, Yellow = net outmigration for 2011, Blue = net in-migration)
In 2011, I moved from an outbound state to a balanced state. Interesting how a lot of the pharma states (NJ, CT, MA) are net outbound. Also interesting how North Dakota is a net inbound state (Bakken Shale?), while Minnesota is a net outbound. I'm curious as to where North Dakota's new residents are coming from.
UPDATE: Anon0829a and @azmanam both point to this fascinating migration map. Apropos of nothing, here's Champaign County, IL.