Computability Logic Homepage
Main online source on computability logic - a recently emerged formal theory of computational tasks and resources. Maintained by G.Japaridze.

Introduction to Mathematical Logic
Hyper-textbook for students by V. Detlovs and K. Podnieks.

Logic
Wikipedia article.

Logic
Open Encyclopedia entry. Hierarchically organized by subareas.

Math Front: LO Logic
Front end for the logic section of the mathematics e-print arXiv.

Mathematical Logic and Foundations
From The Mathematical Atlas, a resource of mathematics maintained by David Rusin. Extensive resources related to logic and set theory.

Mathematical Logic around the World
A rich collection of links to logic-related websites.

Mind Versus Goedel by Damjan Bojadziev
Compares the mind to advanced computers and artificial intelligence, as Goedel would possibly view them.