UDK Links

NPC:
NPC Code für Verfolger und Roaming
Random movement
Mouse Style AI & Pathfinding

Multiplayer:

Setting up a 2Players-Local-Multiplayer-Game
Multiplayer Over LAN
Multiplayer Ideas and Discussion
Basic Splitscreen Information
Co-op Games
UDN Networking Overview

Inventory:
Inventory Tutorial
Character Specific Default Inventory

Sonstiges:
Unreal Model Viewer