Why do examples use requestAnimationFrame?
Why are there meta viewport tags in examples?
How to change color of Fog?
Are there tools to help me build a scene in Three.js?
How Matrices work in Three.js
Animated selective glow in Three.js by BKcore
Max to Three.js workflow tips and tricks by BKcore
On the twelfth day of Xmas, take a whirlwind look at Three.js by Paul King
Introduction to Three.js by Ilmari Heikkinen
Getting Started with Three.js by Paul Lewis
An Introduction to Shaders – Part 1 by Paul Lewis
An Introduction to Shaders – Part 2 by Paul Lewis
Creating Particles with Three.js by Paul Lewis
News & Updates
Three.js on Google+ – frequent posts on Three.js
Subreddit for Three.js – updated almost daily with the latest demos built with Three.js
webgl.com – about half the posts relate to Three.js
Tutorials & Courses
Guida a ThreeJS – Three.js tutorial in Italian
Building A Physics Simulation Environment – Three.js tutorial in Japanese
Einstieg in WebGL mit three.js – Three.js tutorial in German
Learning Three.js – blog where each post is dedicated to teaching as aspect of Three.js