MailChimp's Project Omnivore -- Declassified

In late 2008, MailChimp Labs began Project Omnivore. Our goal was to build a massively scalable tool for our abuse team that could predict bad behavior.

The experiment started with an nVidia Tesla supercomputer, then grew to a cluster of Amazon EC2 servers running a genetic optimization program for 2 weeks nonstop, running over 61 trillion email data comparisons.

Really cool use of GA technology.