Carlo Zapponi created an interactive graph called peoplemovin that plots the movement of people in and out of nations.
peoplemovin shows the flows of migrants as of 2010 through the use of open data (see Data Sources). The data are presented as a slopegraph that shows the connections between countries. The chart is split in two columns, the emigration countries on the left and the destination countries on the right. The thickness of the lines connecting the countries represents the amount of immigrated people.
By clicking on a country, you not only pull up statistics, but also a visualization of where its citizens emigrate to or immigrate from. It's a large chart; the sample here shows immigration to the US, which is the number one destination country. Link -via the Presurfer