NYC Metro Subway Map: The big map, made smaller. All five boroughs, links to transit info.
NYC Board of Education: All the information you could need about the NYC public school system and how it is run.
NY Department of Motor Vehicles: Great if you need a new license or want to locate their office.
Craig's List for New York: Craig's List began in San Francisco as a list of job and housing opportunities, ride shares, entertainment, community events, and more. Here's the New York version, smaller but growing. Friendly, lefty, unpretentious.
NY Public Libraries: On-line catalogs (LEO), addresses for local branches, special events info, etc.
Village Voice: The liberal/radical free newspaper of NY. Political writing, Free Will Astrology, Savage Love, and plenty of arts & music information.
NY City Search: City Search Guide to NY events.
ClubPlanet: Club Guide to major cities including NY
SummerStage: Details about the variety of concerts (including world music, hip-hop, spoken word, and more) presented on stage near E. 72nd St. in Central Park.
Nuyorican Poets Cafe: A great place to hear spoken word poetry, hip-hop, see radical theater, and more.
Columbia University's Postcrypt Coffeehouse: Tiny acoustic venue in a crypt under the chapel. Stone walls, candles, free shows, open mics & folk shows. Fabulous sound quality.