Researchers at Georgia Tech and MIT have developed a proof of concept to demonstrate that it is possible to record a computer user's keystrokes using an iPhone 4's accelerometer. The researchers developed a method to accurately translate the vibrations from typing on a keyboard picked up by the device's accelerometer when placed on a desk near a PC. Though they warn that hackers could potentially use their method to eavesdrop on a user's keystrokes, they believe the actual threat is quite low.