More later. Right now I need some sleep.
I think that 'dated' always refers to a persons grasp of their own history and their historical situatedness. Yes, Arendt does use certain historically situated examples, but I agree with Doc when he says that her theory is as applicable today as it was then. Other related and interesting reads are from the Frankfurt School, with books like 'The Authoritarian Personaity' and 'One Dimensional Man', etc.