Refactoring  
   Website maintained by Martin Fowler, Chief Scientist, ThoughtWorks, and based on his Addison-Wesley book: news, online summaries of the book's refactorings, book errata; refactoring tools, some two dozen useful links.
   http://www.refactoring.com/

Bill Griswold Page  
   Researches software engineering: building large, complex systems at reasonable cost and high reliability; especially evolution (e.g., enhancement) of large systems, which is driven by unpredictable market forces, including customer desire for leading-edge
   http://www-cse.ucsd.edu/users/wgg/

Don Roberts Page  
   Personal page; majority of his work has been working with John Brant to develop the Refactoring Browser, and Smalllint system to detect common bugs and style errors in Smalltalk. Also works with Ralph Johnson at UIUC.
   http://st-www.cs.uiuc.edu/users/droberts/

Martin Fowler  
   Object-oriented programming expert and consultant, one of the leaders in refactoring, author of the book 'Refactoring: Improving the Design of Existing Code', Extreme Programming proponent. Many useful articles and links.
   http://www.martinfowler.com/

Refactoring: Answering the Five W's  
   What is it? Who should do it? Why should one do it? When to do it? Where to apply it? PDF format. [Instantiations, Inc.]
   http://www.instantiations.com/jfactor/files/refback.pdf

The Refactory, Inc.  
   Founded as a consortium of experts in Refactoring, objects, e-commerce, Patterns, Extreme Programming, flexible and adaptable systems; dedicated to helping organizations succeed with objects; evolved from Ralph Johnson Software Architecture group, Univers
   http://www.refactory.com/