Cooperation Studies is an emerging academic field which investigates cooperation.
Howard Rheingold and colleagues at the Cooperation Commons project have done much to popularize it.
The Cooperation Commons A bibliography on the scientific debate on egoism vs. altruism that ensued after the publication of Axelrod’s book, at http://pscs.physics.lsa.umich.edu/RESEARCH/Evol_of_Coop_Bibliography.html
Key Books to Read
Ryan, Frank. Darwin's Blind Spot: Evolution Beyond Natural Selection. Houghton-Mifflin, 2002
"On the importance of cooperation in human evolution."
Genetic and Cultural Evolution of Cooperation (Dahlem Workshop Reports). Ed. by Peter Hammerstein. MIT Press, 2003
Links between cooperation in nature and culture.