Evolution of the Commons

• The Tragedy of the Commons - Garrett Hardin, the original article from Science, 162 (1968)
  
• Preserving the Digital Commons - Daniel McFadden won the Nobel Prize for economics in 2000. He is the E. Morris Cox Professor of Economics at the University of California, Berkeley
• Capitalism and the Tragedy of the Commons - Jonathan Wallace from his web service, Spectacle.org

Also worth looking at:

• Matt Ridley, The Origins of Virtue
• Eric Raymond, The Cathedraal & the Bazaar
• Steven Johnson, Plastic.com
• Starbuck's social responsibility strategy as they evolve the commons
• Upe's paper on Social Information Filtering (ACM, 1995)
• Clay's latest article on Communities, Audiences, and Scale