The Philosophical Gourmet Report is a ranking of philosophy graduate programs in the English-speaking world; it includes links to department homepages. A ranking such as this should be used only in conjunction with the advice of your professors. To read more about the Gourmet Report and the debate it has inspired, start at Keith DeRose's page For and Against the Use of Rankings.
The Philosophers' Carnival Project "aims to showcase the best philosophical posts from a wide range of weblogs. We invite submissions from bloggers and readers, and collate the submitted posts into one big round-up (or "carnival") every two weeks, offering a brief summary of each entry, and a link to the complete post."
National and International
American Philosophical Association "is the main professional organization for philosophers in the United States. Founded in 1900, its mission is to promote the exchange of ideas among philosophers, to encourage creative and scholarly activity in philosophy, to facilitate the professional work and teaching of philosophers, and to represent philosophy as a discipline."
Association for Practical and Professional Ethics "is committed to encouraging high quality interdisciplinary scholarship and teaching in practical and professional ethics by educators and practitioners who appreciate the theoretical and practical impacts of their subjects."
Philosophy of Science Association "promotes research, teaching, and free discussion of issues in the philosophy of science from diverse standpoints. To this end, the PSA engages in activities such as: the publishing of periodicals, essays and monographs; sponsoring conventions and meetings; and awarding prizes for distinguished work in the field."
Society for Ethics "serves the purpose of promoting philosophical research in ethics, broadly construed, including areas such as (but not limited to) ethical theory, moral, social and political philosophy, as well as areas of applied ethics such as (but not limited to) legal, business and medical ethics."
Society for Philosophy and Psychology "is the premier scientific and educational organization for philosophically interested psychologists and psychologically interested philosophers in North America. The purpose of the SPP is to promote interaction between philosophers, psychologists and other cognitive scientists on issues of common concern."
Society of Christian Philosophers "was organized in 1978 to promote fellowship among Christian Philosophers and to stimulate study and discussion of issues which arise from their Christian and philosophical commitments. One of its chief aims is to go beyond the usual philosophy of religion sessions at the American Philosophical Association and to stimulate thinking about the nature and role of Christian commitment in philosophy."
Society for Women in Philosophy "was started in 1972 to promote and support women in philosophy. SWIP holds divisional meetings, meetings in conjunction with the meetings of the American Philosophical Association, and it publishes newsletters."