Google has just announced the release fo the transit layer for 50 cities worldwide. Google Transit has been around for a while, but this actually overlays the transit lines on the map.
As the Google LatLong blog says, using this in combination with hotels and/or restaurants can make life much easier when you’re visiting a city.
For more information, you can also visit Google Maps Mania. The complete list of cities includes 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.
WTF happened to NY????????