What US cities have the best public transportation or mass transit?

and people can it be an answer w/ facts and websites I can go to to get the complete information.

Public Comments

1. The most comprehensive system in the US is probably that in New York City, with Chicago and San Francisco providing the only serious competition.
2. New York City http://www.mta.info/ Chicago http://www.transitchicago.com/ Boston http://www.mbta.com/ San Fransisco/Oakland http://www.bart.gov/ Philadelphia http://www.septa.com/ http://www.ridepatco.org/
3. While public transportation is a disaster in most of Southern California, the City of Long Beach does have an excellent system. Their website is "www.lbtransit.com".