Mathematical Logic and Foundations From The Mathematical Atlas, a resource of mathematics maintained by David Rusin. Extensive resources related to logic and set theory. http://www.math.niu.edu/~rusin/known-math/index/03-XX.html

Abstract Service An archive of abstracts of logic articles at the Institute for Logic, University of Vienna. http://www.logic.univie.ac.at/abstract/

Math Front: LO Logic Front end for the logic section of the mathematics e-print arXiv. http://front.math.ucdavis.edu/math.LO

Mind Versus Goedel by Damjan Bojadziev Compares the mind to advanced computers and artificial intelligence, as Goedel would possibly view them. http://nl.ijs.si/~damjan/g-m-c.html

Classical Logic Introduction to classical logic, including completeness and Löwenheim-Skolem theorems; by Stewart Shapiro. http://plato.stanford.edu/entries/logic-classical/

Mathematical Logic around the World A rich collection of links to logic-related websites. http://www.uni-bonn.de/logic/world.html

Introduction to Mathematical Logic Hyper-textbook for students by V. Detlovs and K. Podnieks. http://www.ltn.lv/~podnieks/mlog/ml.htm

Computability Logic Homepage Main online source on computability logic, - a recently emerged formal theory of computational tasks and resources. Maintained by G.Japaridze. http://www.cis.upenn.edu/~giorgi/cl.html

Logic Wikipedia article. http://en.wikipedia.org/wiki/Logic

Logic Open Encyclopedia entry. Hierarchically organized by subareas. http://open-site.org/Science/Mathematics/Logic/

Multivariable Calculus Textbook by George Cain and James Herod. Chapters in PDF. http://www.math.gatech.edu/~cain/notes/calculus.html