Tim O'Reilly :

This is the future of mobile: to invent interfaces that throw away the assumptions of the previous generation. Point and click was a breakthrough for PCs, but it's a trap for mobile interface design. Right now, the iPhone (and other similar smartphones) have an array of sensors: the microphone, the camera, the touchscreen, the accelerometer, the location sensor (GPS or cell triangulation), and yes, on many, the keyboard and pointing device. Future applications will surprise us by using them in new ways, and in new combinations; future devices will provide richer and richer arrays of senses (yes, senses, not just sensors) for paying attention to what we want.