Very cool visualizations. My favorite one is the unemployment rate by county that iterates through time to show the growth. Very powerful.
In Geography of a Recession, Latoya Egwuekwe uses a short animated visualization to show the spread of the 2008 recession across the United States. By overlaying time, data, and geography, she is able to display both the rapid progression of unemployment and the regions hit hardest. Symbolically, the country visually turns darker as unemployment spreads. This effect of time-lapse on visualization is key to provoking insight from the viewers.