Chicago's WBEZ has created an interactive map of the city and where its various gangs operate, using data provided by the Chicago Police Department. Chicagoist considers the map and its implications while Progress Illinois discusses the changing nature of gang violence.
The official "StreetView" map of China is eerily reminiscent of SimCity, rendered in perfect isometric perspective without a pixel out of place: Shanghai, the Forbidden City, Guangzhou, and Hong Kong. That hasn't stopped companies from trying to create a more true-to-life photographic alternative: there is coverage of Hong Kong and Macau in Google Street View; sanction to cover the rest of China appears to have been given to City8, which covers 40 cities. (The latter site is in Chinese, but Chrome or language plugins do a decent job of translating the content). [more inside]
We've seen that one picture of earth at night. And we all know what Google Earth is. But someone has put the two together. Be sure to check out the map overlays, including the dusk map.
a Google Maps view of NYC, centered on Central Park Google Maps has started displaying subway stops (with the names of the lines that serve each each stop) in New York City. Clearly this is a work in progress (full building outlines are available only in some parts of Manhattan and Brooklyn, and some subway stops currently list only one of the multiple trains that serve the stop). Still, this is excellent news not only for natives but also for tourists (whose only subway-map reference may be the significantly, sometimes radically "not to scale" version put out by the MTA).