Dr. Michael Parenti is "A prolific author, a charismatic speaker, and a regular guest on radio and television talk shows, Parenti communicates his message in an accessible, provocative, and historically informed style that is unrivaled among fellow progressive activists and thinkers."
And humourous too - definetly a must see. That is if you are interested in issues like globalisation, terrorism and conspiracies. : )
Dr. Parenti's speech (2002)
The above speech is one hour long. You can watch the full thing on Google Video.