Computer security expert Mikko Hyppönen presents the history of computer virus and ends to the Internet crime. A delightful talk, with pragmatic examples and a focus to what really matters today: fighting online shenanigans.
Journalist Evgeny Morozov presents an alternative point of view about the Internet impact on politic. After, the Tunasian revolution, I'm sure that digital devices can help, but obviously these are only tools.
Links: Wikipedia: Evgeny Morozov Wikipedia: Tunisian revolution RSA: The Internet in Society: Empowering or Censoring Citizens?