Rendering

Discuss graphics related questions (shadows, lighting, rendering, shaders etc)

Scripts

Discuss general scripts used by the engine (materials shaders, sound shaders, gui scripts, lua scripts etc)

GUI

Discuss GUI related questions (scripts, editing, rendering etc)

Sound

Discuss sound related questions

AI

Discuss AI related questions (navigation system, bots movement etc)

Physics

Discuss physics questions related to game engine development (integration, fixed timestep, middleware etc)

General

Discuss general game engine questions (how do you...? what are you using for...? etc)

Modeling

Discuss methods of model creation, as well as showing your own work, posting tips and tutorials

Animation

Discuss methods of animation creation, as well as showing your own work, posting tips and tutorials

Level Design

Discuss methods of level creation, as well as showing your own work, posting tips and tutorials

Texture Design

Discuss methods of level creation, share and show off your texture work, posting tips and tutorials

Sound Design

Discuss methods of sound creation, as well as showing your own work, posting tips and tutorials

Editing Tools

Discuss general tools (3dsmax, lightwave, motionbuilder, mudbox, photoshop etc)

General

Discuss general content creation and game design, posting tips and tutorials

General Game Development

Discuss general game development questions, posting tips and tutorials (effects in games, papers/presentations)