I've been using maps to draw attention and resources to all high poverty neighborhoods in Chicago so that every neighborhood could have great youth programs operating in non school hours, not just a few great programs in a few neighborhoods. I also maintain a Tutor/Mentor Institute blog which integrates maps and map ideas in its articles. I add new articles each week, such as one today where I'm pointing to a web map of racial distribution in the US, based on the 2010 Census.
Maintaining a map resource requires talent, tech support and operating dollars. As we connect more people who do this work with each other, such as in this web library, my hope is that we find ways to attract these resources to all of us, and that we find ways to partner where we use scarce resources more efficiently.