This site was brought to my attention by the chief curator at the 9/11 Memorial, Jan Ramirez; as an institution we have a vested interest in staying abreast of developments in the digital history world. This website, and its associated blog, were awarded the inaugural Roy Rosenzweig Fellowship for Innovation in Digital History.
The site leans more toward the research resource end of the digital history/public history spectrum; it takes some concentrated exploration to get a sense of its potential. The ultimate payoff is something special-- a new depth of exploration offered by mapping a distinct collection of primary resources available to any researcher in New York City's municipal archives.
Check it out!