New book with the latest advances in Artificial Life. This book, co-edited by Prof. Luis M. Rocha, constitutes the refereed proceedings of the 9th European Conference on Artificial Life, ECAL 2007, held in Lisbon, Portugal, September 2007. The 125 revised full papers presented were carefully reviewed and selected. The papers are organized in topical sections on conceptual articles, morphogenesis and development, robotics and autonomous agents, evolutionary computation and theory, cellular automata, models of biological systems and their applications, ant colony and swarm systems, evolution of communication, simulation of social interactions, self-replication, artificial chemistry, and posters. More information from the publisher's site. Also related is a similar MIT Press volume co-edited by several members of the Complex Systems Group containing the proceedings of the Artificial Life X conference.