It wasn't all that long ago that I checked out a wonderful shooter title called Section 8 which was a lot of fun, but did not have a co-op mode at the time. It's nice to see that the developers thought the same thing I did - this game needs buddies. The sequel Section 8: Prejudice will have its own 4 player co-op mode to allow players to bring along a few friends. The developer blog has recently unveiled the "Swarm Mode" co-op mode.
A recent walkthrough from Eurogamer discusses the features in this Swarm Mode, as well as a detailed encounter in one of the rounds. The walkthrough video details the load-out menu, maps, gameplay process, and the various features in the Swarm Mode. The video is exclusive to Eurogamer, so you'll have to trot over to this link to see what all the fuss is about - trust me, it's worth checking out.