NEW YORK - New Orleans Mayor Ray Nagin opened a visit to New York on Friday by expressing regret for having criticized the slow redevelopment at the World Trade Center site, saying he will "never again refer to that site as a hole." Nagin was in town for a two-day pitch to the New York investment community to get business in his hurricane-ravaged city. While on a stage with the Rev. Al Sharpton and representatives of a New Orleans delegation, Nagin addressed comments he'd made in a recent "60 Minutes" broadcast, where he branded ground zero "a hole in the...