There's been a resurgence of interest of late in My Fair Lady, Lerner and Loewe's classic musical transformation of Shaw's Pygmalion. The Stoneham Theatre did a strong production last year, which rode the coat-tails of the Trevor Nunn touring version that had rolled through town a year or two before. That version starred Lisa O'Hare as Eliza (at left) who is now back in another production, opposite Charles…