This week something by Miron Kovats (miron89, or cselloman), from MALUG (The Hungarian LUG). He built a small plane (Sky-Fly) whose wings are retractable using a smart and compact mechanism driven from a LEGO Technic Linear Actuator.
You will see it all, from the video below.
It was an entry for the LEGO Technic Challenge in March, dedicated to the utilization of "Linear Actuators" in models. Unfortunately it didn't made through this time.
It looks like a movie poster!
You may find a lot more pictures from this miron89's model, at his Brickshelf gallery, here.