40 million Americans move from one home to another every year. In November 2011, Jon Bruner of Forbes created this remarkable set of maps documenting where people are moving to and from using recent statistical data sets from the Internal Revenue Service. Visitors can get started by clicking on any county in the United States to see where people are moving based on this data. Visitors can also compare movements and look at information from the past five years. The interactive visualizations contain many revelations, including the fact that people are moving out of Las Vegas en masse since 2009. The analytical commentary is provided by four experts, including Michael Conzen of the University of Chicago and demographer William Frey. The four accompanying essays are well worth a read, and include pieces titled "The Great Human Capital Swap-Meet" and "Vibrant Flux".