The one I know of is http://www.waiterrant.net/
I read it for a while but I think he's obnoxious and makes a lot of stuff up (come on, EVERY woman wants him and flirts with him in an obvious manner?). I finally stopped reading it because I just couldn't buy what he was selling: didn't make sense in terms of human nature.....
It's for more than just Boston: see www.shamelessrestaurants.com . It's a largely unmoderated board, so there's a lot of nasty, unfiltered, unhelpful stuff there, but it's plenty interesting reading, and some people actually stay on the intended topic, which is exposing exploitive and abusive restaurant owners and managers.