I have always been fascinated with the use of paper, especially using this medium to build things. I define paper as anything derived from a tree. So that runs the whole array of materials from paper, cardboard, and all products manufactured from paper.
In my pursuit of research I recently found three resources and sites that either display some astounding paper models or share some simple techniques to get you started working with paper.
This Insane Paper Plane Has Taken 10 Years to Build
Paperholm (here are four links feature the works of Charles-Young) Miniature city built from paper. Many of the structures include animated elements.
Intro to Paper-craft: Structure and Detail (this two page PDF will introduce the reader into the art of paper-craft)