Unemployment trend comparison
http://bl.ocks.org/e3e065fe80f2b0084bef
It allows you to select two areas and compare their unemployment rate trend in a line chart.
A simpler (no interactive) version of this visualization can be seen at
http://bl.ocks.org/bf052279a4dd5c35bd11
EU Unemployment Time Map
http://bl.ocks.org/ea6330880dd608fc8a48
It displays a European Union choropleth map of the unemployment rate. Hovering over the different years updates the map colors.
A simpler (no interactive) version of this visualization can be seen at