This Chicago Magazine article has animated poverty maps showing the change in poverty distribution in the Chicago region since 1950. Those who work for social justice, equal education opportunity, etc. should be using maps like this to plan ways to distribute volunteers and dollars into places where poor people are moving, while keeping resources flowing in places where large concentrations still live. See how Tutor/Mentor Institute, LLC use maps to mobilize resources that support volunteer-based tutor/mentor programs in the Chicago region.
Program locator - http://www.tutormentorprogramlocator.net/InteractiveMap.aspx
Map Gallery - http://www.tutormentorprogramlocator.net/mapgallery.html
Tutor/Mentor Institute blog articles - here and here