Communities:

Game-Artist

Polycount

GameArtisans

Epic Games

Resources:

Hourences (Unreal)

Valve Development Wiki (Source)

Andrew Klein (Maya, PS, ZBrush)

Mega-Tex (Textures & Reference)

CGTextures (Textures & Reference)

The-Blueprints (Reference)

Friends & Colleagues:

Matthew Jue (Env. Artist)