Intertheory Relations in Physics - Discussion of theory reduction in science; by Robert Batterman from the Stanford Encyclopedia.
Laws of Nature - Philosophical theories about what it is to be a law; from the Stanford Encyclopedia by John W. Carroll.
The Nature and Philosophy of Science - Examines the components, limitations, and popular mistaken beliefs of science and the scientific method. The web page also includes a section on scientific legitimacy.
Philosophy of Science - Essays on philosophy of science from the Proceedings of the Friesian School, Fourth Series.
Philsci Archive - An electronic archive for preprints in the philosophy of science.
Science and Spirituality - Article examines relations between two modes of cognition: rational-scientific and intuitive-spiritual.
Science and the Philosophy of Science - Directory devoted to the field includes definitions, examples (with swans!), glossary, books, induction, deduction and abduction. By Martin Sewell.
Scientific Explanation - Philosophical theories about the nature of explanation in science; from the Stanford Encyclopedia by James Woodward.
Scientific Realism - Stanford Encyclopedia entry on thesis that science discovers truths about a theory-independent reality; by Richard Boyd.
Social Dimensions of Scientific Knowledge - Discussess the impact of social relations and values on scientific research; from the Stanford Encyclopedia by Helen Longino.
Theories of Explanation - Entry on explanation in the sciences from the Internet Encyclopedia of Philosophy.
What Is Science? - Overview of the theory of science from an anthroposophical point of view.
WSRC - Critical Realism - An independent site highlighting the development, interrogation, explication, and application of critical realist methods and analyses; features a bibliography, a glossary, and an archive of papers.