The Battle for Baghdad - NY Times interactive graphic

Here's another New York Times graphic that provides some insight into the evolving situation.

Violence in Iraq - The Battle for Baghdad - New York Times

If you click on the Sunni Area, Shiite Area, and Green Zone labels in the upper right corner, the map will be painted with some subtle coloring that I found helpful.

The forward and back controls that that show you week by week changes did not work well for me, often not responding to my mouse clicks. The pull down menu worked better but of course is a lot more clumsy. A PLAY button with some speed control would have been really helpful.

The time span runs backward to February 11th so this chart doesn't allow comparisons of how post "surge" events relate to the pre "surge" situation.