The concept of superorganisms is fascinating, and as I was reading up on it for a story i’m writing (though it doesn’t really feature much in the story — I just wanted to know more), I found these interesting links:

Superorganism: How One and One Make Three

A Brief History of the Superorganism, part 1 (Wired)
A Brief History of the Superorganism, part 2 (Wired)

Competition, Loss Of Selfishness Mark Shift To Supersociety

Superorganism (wiki)
Ants (wiki)
Eusociality (wiki)
Panspermia (wiki)
Gaia Theory (wiki)