The use of small hardware devices (Arduino, Raspberry Pi, BeagleBone) to hack systems is one I've touched on before. At the recent HackMiami Conference there was a very good presentation on this. I think this is a vector that not too many security professionals are aware of, to their detriment.
HERE is a recent article on some researchers at the Georgia Tech who say they can infect an iPhone via a charger. They will be showing how they did it at the upcoming Black Hat conference.
Apparently it's done with a BeagleBoard, which is a sizable device. A BeagleBone would have been smaller, and easier to fit into a surge protector/power strip then a BeagleBoard. But maybe they were looking for more proof of concept.