O'Reilly Network: XML
A place to discuss the Extensible Markup Language and its family of related standards from the W3C.
xml-doc discussion group
A Yahoo group for XML documentation and publications, such as DocBook, DITA and TEI.
XML-Hypertext
Mailing list for discussing technologies for linking and pointing, hypertext-oriented transformations, and interactions between XML and Web infrastructure.
XSLT Forum
XML and XSLT discussion forum hosted by XIM, Inc.