The latest Killzone 2 making-of video is hereabouts. It features talk of how the environment on Helghast - architecture, streets, you name it - was designed with the politics and philosophy of the inhabitants in mind.
Blimey! Who would have thought that the evil (or misunderstood) Helghastionians would have had either of those? Those things aside, we are also given insight into how the Blu-ray streamed music ensures that the player is not bored senseless by the same tune time after time.
Enjoy.