In this issue: COMMENT "Zero Grounds", by Hendrik Hertzberg: The Ground Zero Mosque. THE TALK OF THE TOWN "Down the Aisle", by Dana Goodyear: The wedding industry cheers the gay-marriage ruling. LETTER FROM TEHRAN "After the Crackdown", by Jon Lee Anderson: Talking to Mahmoud Ahmadinejad - and the opposition - about Iran today. SHOUTS & MURMURS "Who Is Alex Trebek", by Simon Rich. THE ANNALS OF GASTRONOMY "The Truffle Kid", by Dana Goodyear: Supplying fine food in a town where money is no object. ON TELEVISON "Old Mortality", by Nancy Franklin: A review of the new Showtime series The Big C starring Laura Linney.