The initial reaction to the iPhone 4S was cooler than Apple might have hoped. Expectations had been hyped to such a point that people were looking for a leap forward equivalent to the first iPhone. When they couldn’t immediately see it, many were disappointed. But that leap was there — it’s just not one that is easily seen. Siri, the new iPhone’s voice-control software, is going to have as big an impact as that first iPhone did. It’s going to fundamentally change our relationship with computers.