These are some of links that I found during my research.

  1. Information on Christopher Alexander

    General Information

    http://www.math.utsa.edu/~salingar/Chris.text.html

    http://deu.archinform.net/arch/3409.htm

    Pattern Language Repository from the Bauhaus University Weimar

    http://www.uni-weimar.de/architektur/InfAR/lehre/Entwurf/Patterns/patterns.html

    Christopher Alexander's Website

    http://www.patternlanguage.com/

  2. Interaction Design Patterns

    Website by Tom Erickson with very up-to-date link collection.

    http://www.visi.com/~snowfall/InteractionPatterns.html

    hcipatterns.org

    http://www.hcipatterns.org/tiki-index.php

  3. About Writing Patterns

    http://hillside.net/patterns/writing/patternwritingpaper.htm

  4. About Pattern Libraries

    Case Study about the Yahoo! Pattern Library

    http://www.leacock.com/patterns/

    Comparative Analysis of Web Design Patterns and Pattern Collections

    http://www.ui-designpatterns.org/tr/ComparativeAnalysisOfCollections.pdf