I've written a chapter on SceneJS for OpenGL Insights, a book on OpenGL and WebGL techniques which will be published in time for SIGGRAPH 2012. My focus is on the caching strategies and optimisations used to reduce JavaScript re-execution per frame, which may be relevant to others considering writing their own WebGL frameworks.

The book is shaping up to be seriously awesome, with quality chapters ranging from SpiderGL to efficient text in WebGL, plus many chapters on OpenGL ES techniques.