UPDATE An actual, sensible, and strategic "one demand":
"The central message is that in this country, there needs to be more conversation about wealth and power," said 23-year-old student Patrick Bruner (see here).
Who could be against that? And look what's being done to prevent it! Kudos.
UPDATE For Sunday morning, I'm stickying this, unless somebody else wants to start a new thread. See Yves here and the comments. From the Barcalounger and subject to correction by those on the ground: What I would say, re the arrests, is that if the story is now "police brutality" then we've lost control of the narrative of this event and should go on to another experiment. The real story, of course, should be the self-organizing capacities of the occupiers since, after all, isn't the real question at issue who gets to organize what and why? I'm sure the social capital accumulated in the course of Occupy Wall Street is huge, though of course that's not "the story" and never will be. Put that on the balance sheet, let go of the sunk costs, and move on. Bold, persistent experimentation. --lambert]
UPDATE 10:24PM EST Liberty Plaza lined with candles (via) --lambert

UPDATED at end with ride share info and new links
Looks like there is a huge police presence and lots of arrests.
IWW chair reportedly being held; request for help here.
Female protester getting maced: Read below the fold...