Who do you think were the Top 10 most influential people of the 20th century?

Are you just talking political influence? If so, that's a very good list (although I would argue that Hitler is too high, he influenced very little outside of Germany). If you add those who have had major scientific or social influence, the list could change considerably. Off the top of my head, people like Norman Borlaug or Oppenheimer (scientifically) and Elvis or The Beatles (musically) could be considered among the most influential.