See http://www.pbase.com/hjsteed/photo_shoot_111005 for more photos, before the march and the march, to as far as Prince Street where I had to leave it on its way to Wall Street.
I estimate that there were over 2000 people in this march. It was just one group of demonstrators who marched from Washington Square Park to the courthouses at Foley Square
where many groups from other parts of the city converged to march to Liberty Square and Wall Street.