See excellent infographics from 2010 on the Gulf oil spill, America's changing driving habits, and the evolution of privacy on Facebook.
And what were the major themes?
One of the major themes for 2010 was using data not just for analysis or business intelligence, but for telling stories. People are starting to make use of the data (especially government-related) that was released in 2009, and there was a lot more data made available this year (with plenty more to come).
That trend isn't going to slow down at all. I'm predicting another bull year for infographics and data visualization in 2011.