Check out these these fascinating maps from Pew Social Trends which employ a clever and simple use of animation and stylized graphics.
Pew Social Trends:
"Who Moves? Who Stays Put? Where's Home?" [pewsocialtrends.org] is a set of geographical data visualizations that display patterns of domestic migration, that is movement of people among the nation's regions and states. They show gains and losses only from people who move from one state to another. The maps use estimates from the American Community Survey for 2005-2007, and from the American census from the 1980, 1990 and 2000 census.
via: information aesthetics