Here is my quick first pass on it:
Animation
Rigging
Mocap
Camera
Cloth
Data Management
Dynamics
Fur
Games
Interface/Display
Lighting
Modeling
Curves/Splines
Nurbs
Polygons
Subdivision Surfaces
Misc
Paint
Rendering
Mental Ray
Renderman
Misc
Texture/UV
Utility/External
Backup
Copying
Import/Export
Renaming
Misc
Web Related
Suggestions welcome
-deke
Clouds are too nebulous for my taste.
---
Robert