IBM XML Web Site
The xml section on the developerworks web site is your resource for xml-related tools, samples, standards information, education, news and events, and access to xml community forums.
http://www.ibm.com/developer/xml/index.html
The XML information site
The XML information site
http://www.xmlinfo.com/
XML.com
Xml.com, where the xml community shares xml development resources and solutions, features timely news, opinions, features, and tutorials; the annotated xml specification created by tim bray; authoring tools, xml developer resources, interactive forums...
http://www.xml.com/