I just finished watching this great BBC documentary about swarm intelligence. Ignoring the presenter's attempt to inspire fear in us mere humans, with ominous suggestions of a great red fire ant invasion, swarm intelligence is basically the notion that swarms of creatures (such as the aforementioned ant) work as a collective consciousness. It makes intuitive sense: more minds = more processing power. Of course, these species have been shaped by natural selection to function in this eusocial manner, although whether or not we're discussing inclusive fitness, superorganisms or something else remains outside the programme's scope. In fact, the term swarm intelligence doesn't seem to be a conventional term amongst biologists; too many anthropomorphic connotations no doubt.
Sadly, it is was only available on the BBC until 21.39 GMT, today! yesterday. So get watching. Instead, I'll leave you with the first youtube video I could find about swarm intelligence, which is actually nothing to do with animals and more to do with computing, networks and information management: