http://evolution-institute.org All things viewed through the lens of evolution. Some original content, and also a great many pointers to relevant articles published elsewhere. Hosts http://socialevolutionforum.com/, a group blog for social evolution discussion.
http://edge.org/ Editor John Brockman finds interesting people and gets them to write articles and do interviews. There's an emphasis on the “third culture” viewpoint from those interested in crossing the boundary between science and humanities.
http://www.rosenfels.org A website dedicated to the ground-breaking work of Paul Rosenfels in developing a science of human nature. Includes all his original texts, a search engine, and contributions from many of his friends and students.