I found a very interesting paper on Skype presented on Black Hat Europe 2006 conference. Scary too. I guess secure communication is one of the clear cases where open source software has an inherent advantage for the user...
End of the World
Here you can download video of EROS-A satellite launch. It was put into space using mobile Topol missle launcher. Since exactly the same thing would be used if nuclear war started, this video gives you an idea of how the End of the World would look like.