The Health team at Bing used public data to create a Health Map application (requires Silverlight) that lets users visualize a number of health indicators, such as obesity and premature births, by U.S. county.
Location-based social game FourSquare no longer has limits to where it can be used. When users click on their city name below the header of the website, they see a search box to enter a new city. Previously the service supported about 100 cities worldwide and anyone who lived elsewhere was out of luck.
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.