Trent Reznor of nine inch nails fame recently commented on his experience working on the upcoming PC/Xbox title "Doom 3", you can read about it here. The theme song for the game eventually went to Tweaker, aka Chris Vrenna, formerly of nine inch nails. You can find a short clip of it online here.
I've been told you came listen to the full song at Tweaker's MySpace.com page, but I've yet to find it. Cool sample though. I've been waiting for Doom 3 since I first heard about it.