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XML Forums and Newsgroups
Learn how to use XML from developers currently using it. Ask questions and get quick answers on these forums on Usenet and other locations
microsoft.public.windows.inetexplorer.ie5.programming.xml
Learn how to write XML documents that are specifically for Internet Explorer.
XML-L
A mailing list to allow for general discussion of XML. It's a great starting place for beginners.
XSL List - Open Forum on XSL
This is actually a mailing list rather than a forum, but it's a great way to learn more about XSL.