title: Detect current CPU Clock Speed Programmatically on OS X?
body: <p>I just bought a nifty MBA 13"  Core i7.  I'm told the CPU speed varies automatically, and pretty wildly, too.  I'd really like to be able to monitor this with a simple app. </p>
  
  <p>Are there any Cocoa or C calls to find the current clock speed, without actually affecting it?</p>
  
  <p>Edit: I'm OK with answers using Terminal calls, as well as programmatic.  </p>
  
  <p>Thanks!</p>