Otto sent this article into us, and while it's not generally security related, I do feel as if it's interesting to the readers and it does relate to computers and automation in general.  

Remember when the stock market (DJIA) took a dip on May 6th, 2010?  Lost about 600 points?  Here is a very interesting write up of the crash with charts:

http://www.nanex.net/20100506/FlashCrashAnalysis_Intro.html

There is also a "Complete Text" link on the page where you can read the full write up.  Interesting stuff.

-- Joel Esler | http://blog.joelesler.net | http://twitter.com/joelesler