All 80+ Blender material nodes explained in under 30 minutes - YouTube
Layered Textures Design — Developer Blog
Texture preview in Node Editor in node it self — Right-Click Select
Node-based texturing system design proposal (won't work, this an idea for a GPU based 2D texture authuring node editor) - Blender Development - Developer Forum
Blender 2.8 Design Flaw: The Texture Node Editor - User Feedback - Developer Forum
2D Preview Procedural Textures Inside Nodes - Blender Development Discussion - Blender Artists Community
Translate a texture in Cycles Material node editor? - Blender Stack Exchange