News release: "MBTA General Manager Daniel A. Grabauskas announced the T's partnership with Google Transit and the convenience and ease travelers will have when planning a trip on the authority's bus, subway, commuter rail, and boat service. Similar to the MBTA's Trip Planner, Google Transit, a feature of Google Maps, is a web-based application that plans a trip using public transportation options. The service calculates the route, transit time, and any necessary walking directions. This on - line feature which provides directions in various languages using the [public] transit option on Google Maps; and reaches people that the MBTA trip planner does not by surfacing public transit itineraries as an alternative when a user does a directions search within Google Maps. Including the Boston Metro area, Google provides transit information for many major cities across the United States and elsewhere around the world. Transit trip planning is also available on mobile phones including iPhone, Blackberry, Windows Mobile, S60, and other Java enabled phones."
1) Go to http://maps.google.com
2) Click on Get Directions, then enter your start and end points.
3) Select By Public Transit from the drop down menu