Koroush over at TweakGuides sends word that he's finished his guide for Q4 already. Man, that guy's fast, ain't he?

"This Quake 4 Tweak Guide covers all the in-game settings in detail, including screenshot comparisons of image quality differences, and contains a wealth of links to important Quake 4 resources. The guide is rounded out with advanced tweaks which have been tested and work on Quake 4, since some of the Doom 3 commands are different for this game."