Google Maps added a transit layer to its terrain and sat and road views today for viewing bus, train and ferry lines, etc. There’s no NY support, but these 50 cities are covered:

The full list of cities is Belo Horizonte, Berlin, Bordeaux, Brasilia, Cairo, Capetown, Caracas, Chicago, Copenhagen, Dallas, Dortmund, Duisburg, Düsseldorf, Ekaterinburg, Essen, Frankfurt, Genoa, Guadalajara, Hamburg, Helsinki, Johannesburg, Kazan, Köln, Lille, Lisbon, London, Lyon, Madrid, Marseille, Medellin, Mexico City, Melbourne, Monterrey, Montreal, Munich, Naples, Nizhniy Novgorod, Oslo, Paris, Perth, Portland, Porto, Porto Alegre, Prague, Pretoria, Recife, Rennes, Rio de Janeiro, Samara, San Francisco, Santiago, Sao Paulo, Seattle, Strasbourg, Toulouse, Tunis, Vienna, Warsaw.

[Google via TechCrunch]