Here are some links to other good sites about Yi Jing:
Site of the Institute for the History of Natural Science , Chinese Academy of Sciences
Site of the Department of Philosophy, Peking University
Site of I Ching links and bookmarks
Site of the Center of Zhouyi and Ancient Chinese Philosophy
Site of the Needham Research Insitute, a centre for the study of the history of East Asian science, technology and medicine.
Site of Yi Jing Algebra, The Yi Jing in the Information Age