Google Transit!

Yep it's finally here!  I know we have other google threads, but this would get lost in the other threads.  Not sure how accurate it is, but seems pretty decent so far:

http://maps.google.com/help/maps/transit/index.html#utm_campaign=en&utm_medium=et&utm_source=en-et-na-us-gns-trs&utm_term=TransitHomepage