Dead Logicians Society - Warwick university's very own logic society aiming to increase and stimulate interest in logic and philosophy of logic at the university. Offers news and events.
Frege's Theorem - Article in the Stanford Encylcopaedia of Philosophy, entitled `Frege's Logic, Theorem, and Foundations for Arithmetic'. Discusses the 1980 discovery of Crispin Wright that Frege's work of the Grundgesetze can be carried out in second-order logic with Hume's principle.
Logic - An online textbook by Garth Kemerling, explaining the basic elements of elementary logic at an undergraduate level.
Logic and Mathematics - Essay on the nature of logic and its relationship to the philosophy of mathematics, written by Stephen G. Simpson.
The Logic Course - An interactive course in formal logic, with tutorials and quizzes on critical thinking, truth-tables, and sentential.
Nordic Journal of Philosophical Logic (NJPL) - Edited at Dep. of Philosophy, Univ. of Oslo, published by Scandinavian U.P. in hard copy and on WWW. Full-text Web edition free for personal use.
Peirce's Logic - Article in the Stanford Encyclopaedia of Philosophy, by Eric Hammer.
PHILOG - The Danish Network for Philosophical Logic and its Applications.
Symbolic Logic - Online resources provided to supplement undergraduate course taught by Peter Suber. Good collection of handouts.