I recently saw this great video with this neat feature that lets a user control certain computer applications by blowing straight at the screen.
Georgia Tech students have developed a program that, using one microphone only, lets you process and select different items on your computer by blowing on it. This may be set up using a short calibration session.
This could be helpful for individuals with certain physical disabilities. In addition, the video below featuring a Jack Sparrow look-alike illustrates different applications it may be used for, such as: games (blowing out candles), screen scrolling, and more. If this technology truly exists and works as presented in this video, it would be a great advancement.