Unflattening - Sousanis and Understanding Comics both use comics to present complex points about comics
Gödel, Escher Bach presents an exploration of twisting, self-referential representations in a book whose form is itself twisting and self-referential
Meaningness uses a fuzzy, non-hierarchical hypertext structure to present arguments about the essential fluidity of everything.
Tufte’s books instruct on how to present information clearly and efficiently, on pages which have been meticulously designed to themselves exemplify those practices.