Idylls of the King - The entire twelve books, including the dedication, in one plain text format file. Also available as a zip file. At Project Gutenberg. - http://www.gutenberg.org/etext/610
Lancelot and Elaine - The text of the third book provided by the University of Virginia Library. Contains illustrations from a manuscript of "Elaine" in their Special Collections section. - http://etext.lib.virginia.edu/etcbin/browse-mixed-new?id=TenLanc&images=images/modeng&data=/texts/english/modeng/parsed&tag=public
The Idylls of the King - The twelve books displayed on individual pages in HTML format. - http://www.cs.uregina.ca/~barnard/idylls.html