Great find. Today and in 20 years when people look back at the early years of programming (and in particular 3D graphics/games) there will be a handful of names that stand out, John Carmack, Michael Abrash, are probably two the greatest of our age. When they speak, it's worth listening.
VR - "Virtual Reality" aka pup on a headset and see/interact in 3D has been one of the holy grails for a long time. Abrash thinks it's really truly almost ready for prime time and that it will be "here" sooner than most people think.
He talks about the "magic" of VR and the VR presence.
Worth a read.