Here's an idea for improving the Src docs' category pages. I've made two columns (as best I can) and cut down on the number of entries, though there is still plenty of room down the right side. Problems: lots of HTML to handle what the wiki can't, can't have editable sections, can't seem to get cell padding to work, and there's a phantom code box in Abstract Mapping.
If this design doesn't prove too unpopular, I'll add colours to each section too, perhaps even some snazzy 'watermark' backgrounds. See User:Zozart/category_test!
Ammunition | Animals & Creatures | Antlions | Beams & Lasers | Cables & Ropes | Clouds & Sky | Color Theory | Combat | Combine | Doors | Dust, Fog & Smoke | Elevators | Level Transitions | Environmental Lighting & Weather | Explosions | Fire | Foliage | Glass | Headcrab | Health | Ladders | Lighting | Optimization | Physics | Retinal scanners | Sound & Music | Special effects | Terrain | Trains | Turrets | Water | Zombie