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The video below appeared on YouTube today. While watching it, I was quietly impressed and engaged by the developer's walkthrough of the bridge level's design.
Andreas Öjerfors also spoke about the use of id Software's MegaTexture [http://en.wikipedia.org/wiki/MegaTexture] system that allows for the use of a single extremely large texture over a single object - say, a crumbling wall of the destroyed bridge, for instance. The idea, if I understand it right, is to remove the repetitive downside of tiled textures - look at the distant hills and underwater sands in Oblivion for a good example of that. The game's textures often looked blurred and took up a whopping 50GB of hard drive space. Then there was the unfortunate state that Rage turned out in...I suppose the technology requires further tweaking.
So, share some of your favourite developer commentary in the form of videos, interviews or whatever you like and tell us why it engaged you so.