Viral Evolution
As a big fan of the explanatory power of Darwinian evolution - which, for those still concerned about its "theoretical" status, is basically just maths - I have to say I'm impressed by this story:SpamThru takes the game to a new level, actually using an anti-virus engine against potential rivals.
Of course, this is precisely the same strategy that baby cuckoos use. Self-standing, evolving computer viruses living across the Net are getting ever closer....