Algorithms and Complexity Research Area - The Oxford University Computing Laboratory's area on algorithms and complexity, with links to lectures and information.
Automata, Computability, and Complexity, Spring 2005 - Course 6.045J / 18.400J at MIT OpenCourseWare with introduction to basic mathematical models of computation, Turing machines, Church's Thesis, time complexity and NP-completeness.
Challenging Benchmarks for SAT and CSP - Includes related links, references and a summary of the results for the SAT benchmarks used in SAT Competition 2004.
ECCC - Electronic Colloquium on Computational Complexity - A forum for the rapid and widespread interchange of ideas, techniques, and research in computational complexity. Research reports, surveys and books; meetings, discussions and web resources.
SAT Live! - A collection of up-to-date links about the satisfiability problem (solvers, benchmarks, articles). A discussion forum is available as well.
SATLIB - The Satisfiability Library - A collection of benchmark problems, solvers, and tools. Provides a uniform test-bed for SAT solvers as well as a site for collecting SAT problem instances, algorithms, and empirical characterisations of the algorithms' performance.
Theoretical Computer Science links - A collection of bookmarks to algorithms and complexity resources maintained by Heribert Vollmer at the Theoretical Computer Science Institute, University of Hannover.
Theory of Computation, Fall 2006 - Course 6.045J/18.400J at MIT OpenCourseWare, emphasizing computability and computational complexity theory.