Fascinating map and data from National Geographic. Where do rich (and poor) people live?
Also, some interesting visualizations on what we all generally know to be true: income is positively correlated with quality of life and wastefulness.
Some variables that are positively correlated with income include life expectancy, access to sanitation, years of education, literacy rate, net migration rate, urban population, phone subscriptions (there are more cell phones than people in rich countries?!), internet access, personal computers, cars, and carbon dioxide emissions (!).
Variables that are negatively correlated with income include deaths and population growth.