Research Design - Online course by Richard McCleary at UC Irvine, with four modules on philosophy of science, theory (logic and the scientific method), measurement, and validity.

Science Studies Web Server - Resource site at the University of Missouri.

Philosophy of Science Resources - Resource page supplementing Bruce Janz' philosophy of science course.

Incommensurability Literature - Bibliography on incommensurability and related matters.

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.

What is science? - Overview of theory of science from an anthroposophical point of view.

The Nature and Philosophy of Science - Examines the components, limitations, and popular mistaken beliefs of science and the scientific method. The web page also contains a section on scientific legitimacy.