“Flight And Expulsion” is a nice flash-based interactive visualization of various refugees and arrivals at several countries around the world. You can view the data in a map form, or (in what is my favorite view) a circular flow diagram showing where people are leaving to or arriving from. From the Information Aesthetics writeup:
Each visualization view highlights the relationships between the countries that people flee from and migrate to. In the “Flows” view, the countries are connected through a sort of Sankey diagram. The “Connection” displays the same data as a circular network diagram, while the “World Map” provides a classic geographical overview. The “Country Details” dashboard, available when a country is selected, gives more detailed information about the same statistics. The interactive timeline at the bottom allows the exploration of any trends or changes over time.
