W3C HTML Home Page

The W3C's HTML website, including information about HTML and XHTML.
http://www.w3.org/MarkUp/

The HTML Writers Guild

Details the main differences between HTML and XHTML.
http://www.hwg.org/opcenter/gutenberg/markupXHTML.html

XHTML: Where XML and HTML meet

Discussion of XHTML 1.0 and how it improves on the HTML 4.0 standard. Examines the issues involved in the transition between HTML and XHTML. Also explores backwards compatibility to HTML and XHTML modularization.
http://www.webreference.com/xml/column6/

NYPL Styleguide

XHTML 1.0 overview. Includes discussion of accessibility and document validation. Also XHTML authoring tips and tools featuring the use of Dreamweaver.
http://www.nypl.org/styleguide/xhtml/

XDG: XHTML Design Guide

Introduction, tutorial, standards documents, and links to articles.
http://www.onaicul.com/xdg.html

New Architect

Article exploring the issues involved in migrating from HTML to XML.
http://www.newarchitectmag.com/documents/s=4991/new1013637273/

XHTML is the Most Important XML Vocabulary

An article covering possible future outcomes for version 2 of the standard.
http://www.xml.com/pub/a/2003/05/21/deviant.html

XHTML Web Design for Beginners

An introductory article for those with no prior experience of HTML. Covers version 1.0 Transitional.
http://www.miswebdesign.com/resources/articles/web-design-xhtml-1-1.html

XHTML :: How to succeed

Tips and caveats on HTML to XHTML migration for existing browsers.
http://ptaff.ca/xhtml/?lang=en_CA

The case for XHTML

A article dispelling myths about the XHTML versus HTML debate.
http://www.kurafire.net/articles/case-for-xhtml