Refactoring

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/

Catalog of Database Refactorings - Catalog of small changes to your database schema which improves its design without changing its semantics.
http://www.agiledata.org/essays/databaseRefactoringCatalog.html

Refactoring as Meta Programming? - Suggests a different context than usual. Dave Thomas. JOT: Journal of Object Technology. <small>(January, 2005)</small>
http://www.jot.fm/issues/issue_2005_01/column1/

Refactoring to Patterns - By Joshua Kerievsky; Addison Wesley, 2004, ISBN 0321213351; interactive CD available. Jolt award winning book, merges refactoring (process to improve design of extant code) with patterns (classic solutions to recurring design problems). Industrial Logic.
http://industriallogic.com/xp/refactoring/

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, University of Illinois.
http://www.refactory.com/

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/

A Survey of Software Refactoring - Abstract and many references, from paper with overview of research; link to full paper, for fee. IEEE Transactions on Software Engineering.
http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/trans/ts/&toc=comp/trans/ts/2004/02/e2toc.xml&DOI=10.1109/TSE.2004.1265817

Code Refactoring - Wikipedia - Overview of definitions and methodologies.
http://en.wikipedia.org/wiki/Code_refactoring

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 functions.
http://www-cse.ucsd.edu/users/wgg/

SourceMaking: Refactoring - Catalog of 74 classic refactorings.
http://sourcemaking.com/refactoring