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