There have been numerous photos from the exchange visitors gallery but this one I really liked because it was caputured using Gigapan software which allows very sharp, detailed zoom. The above photo was taken at 12:03pm on August 27, 2008 and needless to say almost four years later the floor is much emptier now.
For the link of the above photo in gigapan format to zoom in and play around with, click here. It really is amazing the detail because the wall boards easily can be read, even some computer screens are clear and it also captures the majority of what floor trading consists of which is traders/brokers waiting around for something to happen.