The Districtâ€™s ShotSpotter has detected 39,000 outdoor gunshot incidents in the past eight years. Sensors cover about a third of the city and are concentrated where gun crime is highest. It allows police to respond immediately to the exact location where shots are fired and provides a dramatic picture of the danger faced in many neighborhoods. Results are displayed here using MapBox.
If the Queen of England used public transportation, she wouldn't have far to walk from her Buckingham Palace home. And finding her nearest stop is now very easy since Transport of London has implemented a Google Maps mashup of bus routes.
There is something to be said for simplicity, especially when it comes to applications that leverage web APIs for mobile devices. Enter Sparrow, an application for the iPhone, that serves as a good example of how a few web APIs can be elegantly implemented for use on a mobile device.