Struts Framework

Struts website at Apache Jakarta is the primary resource for the Struts framework.

Husted.com maintained by Ted Husted, one of the key developers behind Struts, provides many useful information, like examples, collection of common Struts extensions and hand-picked archive of messages on important topics discussed on Struts' mailing lists

Extreme Programming

ExtremeProgramming.org and xprogramming.com are the sites to visit if your are new to XP.

Refactoring Home Page
Martin Fowler's Refactoring site

Other Interesting Sites

http://agilemanifesto.org/

http://www.objectarchitects.de/

http://www.fusebox.org

http://www.theserverside.com

http://www.agilealliance.com

http://www.fawcette.com