I'm a big fan of Wolfram's work in "A New Kind Of Science". Of course, I don't pretend to understand anything he's saying, but I do love the pretty pictures...
Anyways... he's released the entire contents of the book online. Not only is the book up there, but each section is linked to downloadable programs which demonstrate the principles in the chapter.
Scanning this again this morning reminded me of his "Principle of Computational Equivalence", which basically suggests that all processes that are not obviously simple can be viewed as computations of equivalent sophistication. There is a certain simplicity and beauty in his message. What if the entire apparent complexity of the-universe-as-we-perceive-it could emanate from an extremely simple rule?