I said educate yourself. ;-)
A sampling:
http://wewanteverything.wordpress.com/2009/09/24/communique-from-an-absent-future/
http://anticapitalprojects.wordpress.com/2009/11/19/anti-capital-projects/
http://uclaresists.blogspot.com/2009/11/communique-from-ucla-occupation.html
http://anarchistnews.org/?q=node/11570
http://occupyuci.wordpress.com/2010/01/14/new-flier-occupy-everything-demand-nothing/
By the way, because I don't think I was clear, I don't mean to say that it's wrong to criticize the strategy of not having demands; I meant to say that you can't criticize them for not having demands because that is the strategy.