Couple of the presentations that I have watched and admire in the list:

Steve Jobs introduces the Macintosh in 1984 Dr. Martin Luther King’s I Have a Dream speech in 1963 Seth Godin talks about Marketing at Google in 2006 Guy Kawasaki’s Art of the Start speech at TiECon 2006

Which presentation do you think the best? Top 10 Best Presentations Ever – [KnowHR Blog]