No 9 Park - French and Italian, very good food and wine, superb cocktails and service
Clio - French with Asian accents, probably the edgiest tasting menu in Boston (for better or worse), with some glimmers of food science techniques
L'Espalier - the most formal restaurant in town lets its hair down a bit with Wine Mondays, a $60 prix fixe for food and wine. 3/31 is Burgundy.
Ten Tables - the best value in Boston fine dining, this small restaurant in JP offers a nightly four course vegetarian tasting menu for $25