University of Trento, Italy, December 16-17, 2004
Unless you count behavioral economists or cognitive scientists, social scientists weren't invited to these reindeer games. Still, it's worth browsing the program (presentations in PowerPoint).
Presentations I found interesting:
Cowan, George. "The Transition from Scientific Computation to Computing with Scientific Concepts"
Chlamtac, Imrich. "Interdisciplinary seeding in complex systems"