Havana, Cuba - Quite apart from any deals struck here, the landmark U.S.-Cuba trade show that ends Monday has been a public relations windfall for Fidel Castro, who has played the solicitous host with charm and mastery. The old man of history has left some of his American guests aglow. Others are shaking their heads at his pure political skill. At the fair's official dinner Saturday night, Castro delivered a 20-minute speech, thanking the Americans here for their "initiative and courage" and praising the "great values and human virtues we have always recognized in the American people." Given the Bush...