Further details: http://www.soas.ac.uk/cisd/events/27oct2009-noam-chomsky-crises-and-the-unipolar-moment.html
It is widely felt that the fall of the Soviet Union left a unipolar world, dominated by the remaining superpower, and that the "moment" is coming to a close with the collapse of the Anglo-Saxon "free market" economic model. Investigation of this two-decade "moment" can provide considerable insight into what came before, and possibilities for shaping the future.
Please note that Chomsky's presentation starts 11 minutes in.