I have a vegetarian friend with whom I often dine, and have trouble coming up with options other than vegetarian restaurants. As an avowed meat eater, I often forget whether non-vegetarian restaurants that I like have a good slate of vegetarian options! =)
Actually, I've enjoyed trying vegetarian restaurants that I honestly otherwise probably would not have sampled, and of course good Chinese restaurants always have an array of vegetarian dishes.
But I would also appreciate hearing about restaurants with a particularly good vegetarian dish or two --- especially new restaurants since I've been gone from Boston for several months.