If you watched the unbelievably gorgeous trailer for id's new action title, Rage, and were curious as to how they're getting a beast like that to run across the PC, Mac, PlayStation 3 and Xbox 360 platforms with little additional effort, the answer is simple: John Carmack is a genius. That's the short version of it, anyway. The long version can be found here in GameTrailer's two part walk through of id's Tech 5 engine, hosted by the icon himself, John Carmack.
Tech devotees need only apply, but if you're looking to learn a thing or two about development in this day and age, it's not a scary as it may seem. The second part of this series has been embedded after the break for your viewing pleasure.