Google's done a super good job on search; Apple's done a great job on the IPod.

Apple has always leveraged technologies that the PC industry has driven to critical mass - the bus structures, the graphics cards, the peripherals, the connection networks, things like that - so they're kind of in the PC ecosystem and kind of not.

Software substitution, whether it's for drivers or waiters or nurses - it's progressing. Technology over time will reduce demand for jobs, particularly at the lower end of skill set.

Software is a great combination between artistry and engineering.

Microsoft Research has a thing called the Sense Cam that, as you walk around, it's taking photos all the time. And the software will filter and find the ones that are interesting without having to think, 'Let's get out the camera and get that shot.' You just have that, and software helps you pick what you want.

The truth of Moore's law has made remarkable things possible. On the software side, I think natural user interfaces in all their forms are equally significant.