Hundreds of the city’s cops and firemen, mindful of how the nation reached out to New York after 9/11, made their way to New Orleans to do what they could to relieve that city’s ongoing agony. Meanwhile, keeping an empathetic eye on the Gulf Coast (and a skeptical eye on the White House), New Yorkers reacquainted themselves with the dubious pleasures of actually putting in a productive day at the office. Mayoral hopefuls made one last effort to distinguish themselves from one another before the primary. Polls showed that Fernando Ferrer held a less-than-decisive lead, and Anthony Weiner, the least boring of the lot, had pulled into second place, prompting such execrable headlines as WEINER’S HOT and WEINER ON A ROLL. There was further evidence that Chihuahuas are the new “It” dog: Scarlett Johansson brought hers along while shopping at a Manhattan greengrocer, and adult-movie star Marco Rossi (Romeo and Julian: A Love Story) reportedly had one in tow as he was being ousted from eyewear magnate Robert Marc’s East Hampton villa. Police statistics showed last month to have been a relatively bloody one, and tabloids blazoned the stabbing of a 10-month-old by a deranged man, which might have been fatal had it not been for yet another heroic nanny. Bruce Willis treated himself to a manicure at an Upper East Side shop, demonstrating that he has masculinity to burn. Bob Denver, a New Rochelle native, died at 70. Although most Americans think of him as Gilligan, the chattering classes here will always remember how deftly Denver filled in for Woody Allen in the 1970 Broadway run of Play It Again, Sam. And Monica Lewinsky let it be known that she was abandoning Manhattan for London, where, at the age of 32, she is to begin graduate study at the London School of Economics. Thirty-two years old! It seems like only yesterday that she was crawling around the floor of the Oval Office.