so, heres a link to a desktop i recently made with a doom 3 screen shot i took:
http://www.fathippo.net/images/specialk/Wallpapers/headless%20closeup.jpg (notice the "Doom 3" logo in the top right)
I will post some more screen shots
btw, I have a Athalon XP 2500+, Radeon 9800 Pro (with 4.9 Catalyst beta), and 768 mb (generic) ram. I run at 1280x1024 High Settings. I can run 1280x1024 Ultra High settings, but its gets choppy when something big happens.