Modular (3D) and regular origami diagrams. The site isn't in English, but the images are sufficient for advanced origami folders. Definitely check out the molecules and cubes.
Amazing modular origami, where toi basically fold a "piece" multiple times, then put all the pieces together to create an awesomely complex-looking 3D origami module.
A good site with lots of pictures and liens to many other sites, including "phone diagrams" (text-only descriptions that toi could read/hear on the telephone).