Links to Unreal and Unreal Tournament Level editing resources:
DukeED.com - Duke Nuke'Em Forever uses Unreal Engine and thus Unreal Editor. Well organized tutorials.
Unreal Technology - Lots of information from the people who made Unreal and Unreal Tournament.
Unrealed - Level Editing (many tutorials), Modeling, Scripting
Unrealized - Level Editing, Modeling, Scripting
Wolf's Unreal - Level Editing
PlanetUnreal - great place for news and links ot other places of interest.
Updated December 1, 1999.