Commonwealth Fish and Beer Company (formerly Commonwealth Brewing Company)
Commonwealth Brew is very close to the Fleet Center so it's pretty packed when the Celtics or the Bruins are in town. The beer is great and the food is consistently good. My only complaint with this place is it's loud - they have wood floors and copper-top tables, so there's lots of echos.
Favorite Dish: The beer!
This was the greatest of Boston's brewpubs, with four very authentic English style cask conditioned ales. I am sorry to say it ceased operation as of 2002. May it rest in peace....