Scientists have developed a sensor which when implanted in a paralyzed man's brain allows him to control machines directly with his thoughts. See the story at BBC.
This should first be great for paralyzed persons and quadraplegics, but it should also help build even better prosthetics for those who lose a limb.
On the reverse side, the fact that this control of machines has been made to work could also provide more evidence regarding what thoughts are, and how they can be read externally. Once that happens, thoughts might even be transmitted directly to other brains.
But I am, of course, merely "Blue-skying." A year ago, though, this device itself was nothing more than "Blue-skying."