I just linked through the New Scientist to this article about computers that are controlled by thought alone.
Apparently you wear a little cap and sort of "train" with the computer for a bit and it learns to recognize activity in different parts of your motor cortex (the part of the brain associated with movement). I can see that this would have amazing implications for people who are paralyzed... or who have prosthetics.
The idea of remote thought-based operation of a computer or robot, or any kind of machinery, really, is downright creepy.
(as visions from various sci-fi-robots-take-over-the-world movies danced in her head...)