I am experimenting with soft robotic actuators lately, and that has me reading papers and tracking what work people are publishing again. This has to be one of the coolest soft robotic ideas I have run across.
Information about this groups research is available here:
Robotic eversion actuators (growing tubes)
I highly recommend looking at their video. Ideas elegant in its simplicity. Arstechnica has a decent writeup of the tech, with a better description of how it actually works available here: Arstechnical Writeup