New York City Subway Map
The MTA puts restrictions on the PDF files of its maps, such that they may not be displayed on this site. Therefore, I offer this map from nycsubway.org, a marvelous online compendium of maps, data and lore of the NYC subway system.
If you feel you must consult the official MTA map you may find it here. The link will also direct you to bus maps, for which I could not find public domain equivalents.