Google Earth teams up with the US Holocaust Museum to track the enormity of the first genocide of the 21st Century: Darfur in Sudan. There’s a wealth of information, both at the personal and the transnational scales. One can zoom in to see the stories of individual children or zoom out to bear witness to the sheer number of destroyed villages.
It would be an easy task to add geographic layers describing the public heath (e.g., water scarcity) and environmental devastation that often accompanies genocides.