Misc. - Catch All - Ideally these will eventually fall into other categories and be better organized.

Association for Community Design

Work Worth Doing

Cyburbia

Hub-Based Community Finding

Global Complexity
http://www.globalcomplexity.org/

Princeton Engineering Anomolies Reearch (PEAR): Scientific Study of Consciousness Related Phenomenon
http://www.princeton.edu/~pear/

Visual Complexity (very visual...and very cool!)
http://www.visualcomplexity.com/vc/

Unlimited Love Institute (not sure how this fits into complexity, but this was discussed at one of our browbags)
http://www.unlimitedloveinstitute.org/

Craig Reynolds - Annotated List of Links for Individual Based Modeling
http://www.red3d.com/cwr/ibm.html

Marvin Minsky's Home Page
http://web.media.mit.edu/~minsky/

Trojan Mice - Helping Organizations Understand Complexity
http://www.trojanmice.com/index.htm

Craig Moodie - Visualization and Complex Systems
http://www.users.bigpond.com/casmoodie/

Mark Voss - Complex Adaptive Systems Research
http://www.casresearch.com/

Complexity in Social Science
http://www.irit.fr/COSI/index.php

The Complexity and Artificial Life Research Concept
http://www.calresco.org/ - also see http://www.calresco.org/lucas/cas.htm and http://www.calresco.org/sos/sosfaq.htm

Robert Goldstone - Indiana University - Software for Demonstrating Complex Adaptive Systems
http://cognitrn.psych.indiana.edu/rgoldsto/complex/

Beyond Intractability - University of Colorado - Complex Adaptive Systems
http://www.beyondintractability.org/essay/complex_adaptive_systems/

Complexity Made Simple
http://www.lciweb.com/Complexity/science.htm

Complexity Science Focus (geared for students)
http://www.complexity.ecs.soton.ac.uk/\

Complexity and Education
http://www.complexityandeducation.ualberta.ca/

Principia Cybernetics Web
http://pespmc1.vub.ac.be/DEFAULT.html (also see: http://pespmc1.vub.ac.be/ASC/INDEXASC.html

Designing for Emergence
http://www.co-i-l.com/coil/knowledge-garden/oi/dfe.shtml

Nonlinear Dynamics and Complex Systems Theory - Glossary of Terms
http://www.cna.org/isaac/Glossb.htm

Systems Thinking
http://www.systems-thinking.org/

Distributed Computing Systems Wiki
http://www.vs.uni-kassel.de/systems/index.php/Main_Page

iDiagram - The Art of Complex Problem Solving
http://www.idiagram.com/CP/cpprocess.html

Complexity Now - PBWiki
http://complexitynow.pbwiki.com/

Center for Nonlinear Studies
http://cnls.lanl.gov/External/

Albert Laszlo Barabasi - University of Notre Dame
http://www.nd.edu/~alb/

Femme Fractal - Women and Complexity
http://www.femmefractal.com/

Agent Link: European Co-Ordination Action for Agent Based Computing
http://www.agentlink.org/