ECCC - Electronic Colloquium on Computational Complexity  
   The Electronic Colloquium on Computational Complexity is a new forum for the rapid and widespread interchange of ideas, techniques, and research in computational complexity. The Electronic Colloquium on Computational Complexity (ECCC) welcomes papers, s
   http://www.eccc.uni-trier.de/eccc/

Computability Theory  
   Directory of researchers working in computability theory, and list of open problems.
   http://www.nd.edu/~cholak/computability/computability.html

Bibliographic Database for Computability Theory  
   Extensive bibliography on computability and recursion theory, maintained by Peter Cholak.
   http://www.nd.edu/~cholak/computability/bib/bib.html

Computability and Complexity  
   An online course on complexity.
   http://www.csc.liv.ac.uk/~ped/teachadmin/algor/comput_complete.html

Problem Solving Environments Home Page  
   This site contains information about Problem Solving Environments (PSEs), research, publications, and information on topics related to PSEs.
   http://www-cgi.cs.purdue.edu/cgi-bin/acc/pses.cgi

Hypercomputation Research Network  
   The study of computation beyond that defined by the Turing machine, also known as super-Turing, non-standard or non-recursive computation. Links to people, resources and discussions.
   http://www.hypercomputation.net/

Church-Turing Thesis  
   Alonzo Church and Alan Turing formulated the thesis that computability coincides with recursivity; by Jack Copeland.
   http://plato.stanford.edu/entries/church-turing/

Introduction to Logic and Recursion Theory  
   Notes from the class taught by Prof. Sacks in the Spring of 1998.
   http://www.media.mit.edu/physics/pedagogy/babbage/texts/rt.html

Computability Logic  
   Encyclopedia article.
   http://www.sciencedaily.com/encyclopedia/computability_logic

Interactive Computation  
   Wikipedia article.
   http://en.wikipedia.org/wiki/Interactive_computation

Computability Logic - Wictionary  
   A dictionary definition of the subject.
   http://en.wiktionary.org/wiki/Computability_logic

Open Questions in Recursion Theory  
   Compiled by Theodore A. Slaman, Berkeley [TeX/PDF].
   http://math.berkeley.edu/~slaman/qrt/