As I mentioned yesterday, I think future Macs will integrate the FaceTime feature of the iPhone 4. And, in time, Macs will probably sport displays whose entire screens can serve as giant iSight cameras for this purpose (and, who knows, perhaps for scanning as well).
In 2006, Apple filed a patent (number 2006007222) at the US Patent & Tradmark Office for an integrated sensing display. Per the patent, the sensing display includes display elements integrated with image sensing elements so the integrated sensing device can not only output images (e.g., as a display) but also input images (e.g., as a camera).
Of course, that patent involves the iSight camera that is currently built into all Macs (at least those with their own displays). However, I think that, in time, Apple will expand the technology so that you have the option of using your entire Mac screen as a videophone — with FaceTime, naturally.
— Dennis Sellers