title: iPhone Proximity Sensor
body: <p>Can the iPhone SDK take advantage of the iPhone's proximity sensors? If so, why hasn't anyone taken advantage of them? I could picture a few decent uses.</p>
  
  <p>For example, in a racing game, you could put your finger on the proximity sensor to go instead of taking up screen real-estate with your thumb. Of course though, if this was your only option, then iPod touch users wouldn't be able to use the application.</p>
  
  <p>Does the proximity sensor tell how close you are, or just that something is in front of it?</p>