The article looks at a mobile tourist app developed by Steve Romalewski, the director of the City University of New York's Mapping Service at the Center for Urban Research. The app is designed to help find "hidden gems" among other storied points of interest in New York. Romalewski is developing apps for other cities as well.
http://cityroom.blogs.nytimes.com/2011/01/30/to-happen-upon-city-landmarks-by-way-of-an-app/
