When introducing iPhone in 2007 Steve Jobs listed three revolutionary user interfaces that Apple has brought to the market: the mouse, the click wheel, and multi-touch.

Now they’ve brought a fourth interface: voice recognition and artificial intelligence. Siri is Apple’s fourth interface.

Steve said that each of the three user interfaces made possible a revolutionary new type of product. The mouse enabled the Macintosh. The click wheel enabled the iPod. Multi-touch enabled the iPhone. What will Siri enable?