There is an excellent Steelers bar in Boston:
Roggie's Brew & Grille 356 Chesnut Hill Ave Brighton, MA 02135
Once the season starts, we get the entire basement bar to ourselves, with the Steelers game on every TV, and it's packed to standing-room-only with black-n-gold. The sign on the door says "Now leaving Boston... Welcome to Pittsburgh!" I wouldn't want to watch the game anywhere else in Boston.
There will be a group of us watching the third preseason game there tonight -- come join us!