I just watched Lawrence Lessig's speech, Free Culture (8.4 MB Flash 5 required) for a second time. This recording was made at the O'Reilly Open Source Convention 2002 where Lessig delivered the keynote. It is a superb example of a well designed and delivered power point presentation. It is also very persuasive.
Throughout the presentation Lessig repeats the refrain:
He concludes with the observation...
It worries me when a lawyer as smart as Lessig calls on people to defend long held freedoms. He strikes me as very level headed and clear thinking and when he claims there is something to be defended I believe he is probably right.