Radical Cartography - Bay Area Poverty Map (2010) [data from 1999]. This website also allows you to view a map of race/ethnicity, children's poverty rates, and education. I recommend checking out the entire site, but I will probably be posting many individual maps from here.
A sad proportion of “art/science” illustrations are more show than tool, evoking but not helping to explain the phenomena that are supposed to be their subjects. This map and variations on it are a distinct counterpoint: they are used daily as a tool by Dick Klavans to determine such things as which areas of science are most closely connected to one another, are most and least intellectually vital, or which scientific areas produce the most patents. didi.com/brad/mapOfScience/