Also, sometimes I see job openings, etc. to the west of Boston (Natick and Worcester in particular) that make me wonder if that region has more going on than most realize.
The route 128 and 495 corridor is where people with cars find tech jobs. A lot of established tech companies in that area. EMC, Bose, iRobot, a bunch more I drive by all the time that I can't remember off the top of my head.
Boston long had and still has many computer industry companies outside the city, especially in the Western suburbs. Maybe 25 years or so ago, there was essentially no tech of note within the city limits. It was mostly along Toute 128 and 495.