Michael comments, "Onionmap is nothing when compared to this Chinese site...They've practically mapped out the entire Shanghai (and quite a few other China cities) in a SimCity-like fashion! Amazing stuff!" He's completely right. Edushi maps Shanghai with great detail. While OnionMap looks like Google Maps with SimCity sprinkles, Edushi is just straight up SimCity.
Unfortunately my three years of Chinese classes in high school did me no good, and I don't understand a thing on the site. Maybe someone can translate and let us know what Edushi is all about. Chinese CitySearch?