From TBO.com:
If spyware and key-logging software weren’t a big enough threat to privacy, researchers have figured out a way to eavesdrop on your computer simply by listening to the clicks and clacks of the keyboard.
Those seemingly random noises, when processed by a computer, were translated with up to 96 percent accuracy, according to researchers at the University of California, Berkeley.
“It’s a form of acoustical spying that should raise red flags among computer security and privacy experts,” said Doug Tygar, a Berkeley computer science professor and the study’s principal investigator.