Intercity bus routes in the Berkshires (western Massachusetts)
New York NY - (other local stops) - Sheffield MA - Great Barrington - Stockbridge - Lee - Lenox - Pittsfield - New Ashford - Williamstown - Bennington VT
Providence RI - (other local stops?) - Springfield MA - Lee - Lenox - Pittsfield - Albany NY
HINT: The Bonanza schedules page makes you enter your origin and destination in a search box, and then gives you a drop-down list of results, even if there was only one match. And sometimes they spell things wrong so you won't find what you want. But if you put _ (an underscore) in both boxes, it will give you the complete list of destinations in the drop-downs and you can choose what you need.
Greyhound / Peter Pan:
Boston - (other local stops) - Springfield MA - Lee - Lenox - Pittsfield - Williamstown - Bennington VT
Boston - (other local stops) - Springfield MA - Lee - Lenox - Pittsfield - Albany NY
Metro North Railroad connecting bus (operated by Short Line Bus):
Great Barrington MA - Hillsdale NY - Copake NY - Millerton NY - Wassaic NY (Metro North connection to NYC). Summer only, two northbound trips on Fridays, two southbound on Sundays.
This information was current as of August 1, 2006.
At some point, I might look up what the local stops are, separate Greyhound and Peter Pan, add the Pioneer Valley and Worcester, and maybe even post the schedules.