I can't remember the address for a website somebody showed me once. It was a google-maps type site only for different transportation modes - i.e. you could put in an address in NYC and one in Washington, DC and it would tell you how to get from one to the other using public transit modes - giving directions like:
Walk to Subway station
Take subway to X station
take train to DC
take metro to X station
walk to XYZ address
And it listed times, etc that it took to get from place to place.
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Edit: yeah... this google one doesn't appear to handle between cities... looks like it's just within city.
Nice, thanks!