AskMaps: Map of New York City with index of streets and city monuments, ready for printing.
City of Neighborhoods - New York City Department of City Planning: Shows the five boroughs and the neighborhoods within them. Also offers detailed profiles of each community in PDF format.
Digital Atlas of New York City: Contains statistical information on population and race, ancestry, income and poverty, adult educational attainment, household types and Commuters.
NYC Open Accessible Space Information System (OASIS): Broad partnership mapping GIS (Geographic Information Services) data on green spaces in the city and making it freely available to the public as well as to partipating agencies and companies.