The foursquare Go library by Yamil Asusta interacts with the API functionalities such as venues, real time, and merchant. The RESTful APIs support XML, JSON, and JSONP. Includes installation, example, and an invitation to contribute on the GitHub project.
Sometimes there's just too much interest in open data. The Greater London Authority has temporarily pulled its feed of the Underground due to "overwhelming demand." The service gave locations of every subway train in the city updating in nearly realtime.