3D games for X-Box, Wii, etc.: going to be a huge market. Touch screen for PC's. When I see how easy it is for my kids to use a touch screen while they are still rather clumsy with a mouse, I know it's going to grow market share rapidly.
In the end, this will apply to business applications. 3D exploration of data with touch and sensory input. Seamless integration of different wireless devices and services that you can simply connect to by waving your hand. Enhanced virtual shopping or augmented reality in store.
I might be a little off, but I'd say it's a likely and nearby future.