While viewing this consider full convergence of these elements. The phone and slate are already merged, my choice for perfect phone/slate would allow interchangeable screens. Kinect is simply an augmentation of the camera. Pixelsense is added to every screen and of course every device has NFC. What else……….? The software to light it all up.

Nsquared’s Seamless Computing, Surface + Kinect + Slate + Phone = amazing interface (video)

“Sydney’s nsquared is calling it “Seamless Computing” — software which unifies Windows Phone 7, Surface, Windows 7 Slate and Kinect. Begin designing a new home on your phone and then place it on the Surface to share between all the devices, then pick up the Slate to make some modifications before walking through a 3D model of the building, navigating with Kinect’s gesture interface. Software like AirPlay and Touch to Share already give you a taste for this sort of tech, but the experience that Dr. Neil Roodyn demonstrates in the video below is far more immersive — not to mention unspeakably cool.