This is a great little video from the Sante Fe Institute -- the home of Complexity Science --  that helps capture what it is and why I'm so passionate about it. 


Some of the best books on the topic I've come across so far: 


Scale - The Universal Laws of Growth, Innovation, Sustainability, and the Pace of Life in Organisms, Cities, Economies, and Companies

by Geoffrey West 

Origins of Wealth (a must-read for anyone interested in economics)

by Eric Beinhocker 

Complexity and the Arrow of Time