The Leather District Gourmet Jacqueline Church and Tom O'Keefe, aka Boston Tweet, appeared today on the Callie Crossley show to talk pizza. After all, this is National Pizza Month. Today the Callie Crossley show was really the Sue O'Connel show, who was standing in for the host, and she and the guests discussed the merits of various Boston pizzerias, including The Upper Crust, Picco and Pino's. In this town that conversation could lead to blows, but Sue, Jacqueline and Tom managed to keep it civil, discussing their ideal slice as well as their plans for dinner: pizza.