Links:

F.A.K.K.² related stuff:

ritualistic.com
FAKKyou.com
ritual.com
fakk2.net
fakking.com
heavymetalfire.com

F.A.K.K.² editing stuff:

Brushboy's "Heavy Metal: F.A.K.K.2 Level Design" (Some good tutorials here, including some on scripting basics)
The Node (Complete Sin scripting reference, nearly the same as FAKK2 Script. Extremely useful)
Goetzenzar's German Q3 and english FAKK2 stuff (FAKK2 stuff on top)
claudec.com (World's largest directory of Q3 mapping stuff, much of it applies to FAKK2 as well)