• Cognitive Computer Science Research Group, UCSD.
• Reed College
• Santa Fe Institute. Here's a partial list of projects there.
• UCLA
• COGS, University of Sussex.
• Dynamics of Computation, Xerox PARC.
• Nobotics, Stanford.
• Avida, Caltech.
• GRAL, National Research Council, Rome.

There's an Artificial Life reading group at MIT.

C. Titus Brown maintains another list of ALife groups. Mark Smucker has a list of people working on Evolutionary Computation and ALife.

Patrick Tufts