History of Philosophy Without any Gaps An excellent website hosting audio lectures and interviews on a vast variety of topics in philosophy. Peter Adamson, Professor of Philosophy at the LMU in Munich and at King's College London, takes listeners through the history of philosophy, "without any gaps." The series looks at the ideas, lives and historical context of the major philosophers as well as lesser known figures.
Aeon: Philosophy A very engaging website presenting essays on current topics in philosophy and ethics.
Stanford Encyclopedia of Philosophy From Stanford University. The Stanford Encyclopedia of Philosophy organizes scholars from around the world in philosophy and related disciplines to create and maintain an up-to-date reference work.
What is Philosophy The basics of philosophical schools and philosophers.
Edmund J. Safra Center for Ethics at Harvard University Provides access to working papers and reports on ethical issues.