The Ergodic Theory of Traffic Jams by David Griffeath
Fluctuations of Randomly Growing Surfaces by Janko Gravner
Still Life Theory by Matthew Cook.
Objets d'Bits: Thinking about Emergent Objects in Cellular Automata by James P. Crutchfield.
Still Life Generation in Conway's Game of Life by Paul Callahan.
Searching for Spaceships by David Eppstein.