"I've recently launched a section of my site which details many of the visual, artistic, occult and filmic influences of Trent & co.
Though some of said content may have been previously posted on yours or other boards, several inclusions are new discoveries I've come across years past, including an shorter article of mine that was published on SeemsLikeSalvation ago."
Over at the aforementioned page -- which contains some NSFW imagery -- you'll find comparisons of Joel-Peter Witkin photography to scenes from Closer, explanation of the occult symbols that appeared on "Dissonance Tour" era t-shirts, video clips from movies from which samples appear in NIN songs, and plenty of other stuff. It's a nice compilation of these things, check it out when you get a chance.