It is two years old, but this NYTimes Iraq casualties graphic (below) is still a great visualization. Click on the image to see a full sized version.
My main complaint with the NYTimes graphic is that it does not show casualty trends. Rather, the graphic is a snapshot of violence. For a good example of visualizing trends, you cannot do better than Minard.
Christopher R. Albon is a political science Ph.D. specializing in armed conflict, public health, human security, and health diplomacy.