CityTransit is a comprehensive guide to traveling through the New York City subway. It includes official maps licensed from NYC's MTA, line data, a GPS-based station finder and live service advisories. Update: A free update to City Transit just came out that has the new maps + data and iphone 4 compatibility!
Pinch and Zoom Our maps are built from high-quality images directly from the MTA. Use the gestures you already know to scroll and zoom, just like in Google Maps. Also, we've got a bus map!
Station Finder From time to time we all find ourselves on the wrong side of town. Whether you need to get away from Williamsburg hipsters or women in fur coats, the GPS-based station finder will help get you out of there in a jiffy.
Service Advisories. Now you won't have to stay home on the weekends! Live service advisories, straight from the MTA's website, give you the latest scoop on which trains are running, which ones aren't and which ones only make stops in the Bronx.