BBC News - Scientists hail robotic hand 'breakthrough'
For one month, Italian scientists demonstrated that a person could control a robotic hand using only neural signals from the nerves in his arm, and was able to perform complex tasks. He was also able to detect sensations in his hand because the link was designed to be two-way. Visit the link to see a video of him controlling the hand.
Also: Crave | Man controls cybernetic hand with thoughts
Edit: Finally found an embeddable link to the video.