Siri has been a revolution in man/machine interface, with Apple selling millions and millions of iPhone 4S units. Clearly Apple is leading the way, and initial reports are that while there are many voice-controlled devices being shown at CES, none quite matches up to Siri. Although it seems likely that many of these voice initiatiives predated Siri, there is no doubt that the success of Siri has spurred their coming to market.