Most people probably know this, but there are no breweries in Somerville--just offices. The Slumbrew guys brew at Mercury in Ipswich I think, and PT uses the Buzzard's Bay facility in Westport. Besides the CBC brewpub, the closest breweries are Harpoon and Trillium in Boston and the "Beermuda Triangle" of Night Shift, Idle Hands, and Mystic in Everett/Chelsea.