The following are some great websites for self-reconfigurable robots in the world.
MTRAN-III reconfigurable robots, AIST and Toyko Tech, Japan
Modular Robotics at PARC PolyBot, PolyPod, Telecube, Digital Clay, etc.
Fukuda Laboratory CEBOT, micro-robotics and all things Fukuda
Dartmouth Robotics Laboratory Crystaline, Cellular Automata, Molecular Robots by Rus
Distributed System Design Group M-TRAN, by Kurokawa, Kokaji, and Murata
Murata Laboratory Satoshi Murata's new research group.
Rensselaer Polytechnic Institute - Tetrobot, a modular reconfigurable parallel robot system
Hokkaido University, Japan - Robotic Amoeba
Carnegie Mellon University - I-Cubes
Carnegie Mellon University - Reconfigurable Modular Manipulator System
Cornell Computational Synthesis Lab
Biologically inspired robotics group in EPFL, Swiss Federal Institute of Technology
University of Maryland Space Systems Laboratory - MORPHbots
Peter's Archive Dr. Peter Will has been working in the MEMS and Robotics industries for decades now, these are some highlight reels from pivotal projects on which he has participated.
USC Center for Robotics and Embedded Systems
Johns Hopkins University - Robot and Protein Kinematics Lab
Unversity of Minnesota - Center for Distributed Robotics
Michigan State University - DARPA Microbot Project
Note that many of these sites were found through links from other sites