Your Guide to Doom 3

• UpsetChaps has a Doom 3 Guide you can check out. The guide covers various tweaks and fixes you can make to the game, console commands, general game info and overall may prove useful to anyone with a machine on the lower end of the spectrum who wants to get more out of the game.
• The Tech Report has also posted a similar guide, though this one mostly deals with graphics settings so you may want to read this one as well if the UpsetChaps guide didn't help out enough.

FP! Sounds interesting!