Spying on someone through their keyboard?
It seems a couple of PhD students (who also happen to own their own computer security firm) have devised (discovered?) a method whereby an eavesdropper can obtain information typed into a keyboard via the electromagnetic signals given off by the keyboard. Here is a link to their research website that includes two demonstration videos. Here’s a link to the lab’s site. This appears to be brand new research, i.e. the videos were just posted and I could not find a link to a paper anywhere. It would be interesting to independently verify this. In all honesty, all you’d need to do to at least buy the feasibility of this is to make sure that for each typed key you could detect a unique and non-random signal.