Always a useful index of city life, they say business has now picked up again after a disastrously fallow period. For months, people didn't go out socially - partly out of sheer fear, partly because it was deemed unseemly to be having a good time. The dead are, of course, still honoured, as they soon will be by a permanent memorial, and the cops and firemen greeted around town with an enthusiasm unfamiliar to all concerned. But the worst-case scenario - feared and fought off by the heroic ex-Mayor Rudi Giuliani - has not come to pass. After a brief wobble, Broadway is doing booming business again, and the tourists have begun to return in their usual droves.