Clear site about the different historical Arthurs:
http://freespace.virgin.net/david.ford2/arthur.html

History and the Arthurian legend (timeline available):
http://britannia.com/history/arthur/

King Arthur, fact semi-legend or myth:
http://www.mystical-www.co.uk/king_arthur/index.htm

A Short History of Arthurian Archaeology by Michelle L. Biehl
http://www.jammed.com/~mlb/arthur.html

Historical Arthur, a sceptic's tribute to the believers:
http://people.a2000.nl/keuche/intr.html

Medieval Arthurian legends:

Early medieval resources for Britain, Ireland and Brittany:
http://members.aol.com/michellezi/resources-index.html#Resources Index

Cath Celtic page:
http://www.celt.net/og/cath.htm

Poetry of Wales:
http://www.webexcel.ndirect.co.uk/gwarnant/index.htm

What do I need to learn medieval Welsh?
http://members.aol.com/_ht_a/lisala/faqs/medwelsh.html

Alison Stones, Professor of History of Art and Architecture specializes in medieval manuscript illumination:
http://vrlab.fa.pitt.edu/STONES-WWW/MASHomepage/stones.html

Thomas Malory society:
http://www.malory.net/frame.htm

The medieval Arthurian legends:
http://www.xs4all.nl/~kite/Excalibur/medi.html

Essays, papers, articles:

Geoffrey of Monmouth and the Arthurian saga:
http://www.noblecan.org/~mfraley/geoffrey.html

The Tournament in the Romances of Chrétien de Troyes & L'Histoire de Guillaume Le Maréchal.
http://icg.fas.harvard.edu/~chaucer/special/lifemann/tournmt/ben-tour.htm

Models of Knighthood in Chretien de Troyes
http://gondolin.hist.liv.ac.uk/~azaroth/university/cdt.html

When Malory met Arthur, a textual investigation of religion and the supranatural in Malory's Morte D'Arthur:
http://jackfritscher.com/miscdocs/morted~1.html

Who Dun It; A paper about who is responsible for the fall of the Round Table in Malory's Morte D'Arthur:
http://www.georgetown.edu/users/drakek/THEPAPER.html#The paper

The politics of violence in Malory's treatment of the Arthurian legends:
http://www.luminarium.org/medlit/cotroneo2.htm

Evidence against Lancelot and Guinevere in Malory's Morte Darthur: treason by imagination:
http://web.english.ufl.edu/exemplaria/harris.html

The death of king Arthur in different versions of the story:
http://www.millersv.edu/~english/homepage/duncan/mideng/students/loria/death.html

Der Ursprung der Gralsage (Yep, it's in German, from 1985 when fantasy was making a comeback), die Artussage in fantasyliteratur:
http://www.edfc.de/efa023a.htm

(French) La Quête du saint Graal et l'imaginaire. Essai d'anthropologie de l'Imaginaire arthurien. Georges Bertin, 1995:
http://perso.wanadoo.fr/g.bertin/%20saint%20graal.htm

Parzival und der Gral bei Wolfram, Chrétien und Wagner (German again, difficult layout, but worthwile):
http://home.t-online.de/home/03581413454-0003/gral.htm

About Merlin:
http://dc.smu.edu/Arthuriana/littleton.html

A close look at John Boorman's Excalibur:
http://www.xs4all.nl/~kite/Excalibur/exca.html

The Haughty Knight (a minor character that appears in two stories of Chrétien de Troyes) Project:
http://www.geocities.com/Broadway/Wing/9026/arthur.html

Much more than an essay: The poem as Green Girdle: "Commercium" in "Sir Gawain and the Green Knight" by Al Shoaf:
http://www.clas.ufl.edu/~rashoaf/sggkintr.htm

Heroes of the Middle Ages:
http://www.luminarium.org/medlit/medheroes.htm

Extensive paper on the Arthurian Legend in fantasy literature during the 1980s:
http://dc.smu.edu/Arthuriana/BIBLIO-PROJECT/DOHERTY/doherty.html

Tristan und Isolde: het kunstwerk en de ethiek. (Dutch thesis about the ethics in Wagner's opera):
http://www.tte.nl/wijsneus/scripties/tristan.html

More links here: Anthology of Middle English Literature Articles and Essays:
http://www.luminarium.org/medlit/medessay.htm

Texts online:

Chrétien's Conte du Graal (Old French):
http://www.uottawa.ca/academic/arts/lfa/activites/textes/perceval/cgrpres.htm

Medieval romances (you can find translations of Chrétien's stories here, but not Conte du Graal):
http://www.enteract.com/~detroyes/omacl.html

Lancelot, Knight of the Cart (Chrétien de Troyes):
http://sunsite.berkeley.edu/OMACL/Lancelot/

The Lais of Marie de France, translation and notes by Judy Shoaf:
http://web.english.ufl.edu/exemplaria/intro.html

Alliterative Morte Arthure (Middle English):
Complicated address, but this link works

From the Camelot project: Stanzaic Morte Arthur (Middle English):
http://www.ub.rug.nl/camelot/teams/sm1.htm

Arthurian passages from the History of the Kings by Geoffrey of Monmouth:
http://www.kzoo.edu/history/Wickstrom/King_Arthur/Monmouth.htm

Sir Gawain and the Green Knight (Middle English):
Complicated address, but this link works

Translation of Sir Gawain and the Green Knight:
http://www.jps.net/pdeane/fgr/

From the Camelot project Lancelot of the Laik (in Scottish dialect):
http://www.ub.rug.nl/camelot/teams/llintro.htm

Fragments of (amongst others) Conte du Graal, Didot-Perceval, Parzival and also the story of the Fisher King as told in the movie called The Fisher King:
http://www.uidaho.edu/student_orgs/arthurian_legend/grail/fisher/texts.htm

The High History of the Holy Graal. (It is not exactly modern English, anyone can read it though):
http://sunsite.berkeley.edu/OMACL/Graal/introduction.html

Lanseloet van Denemerken, Dutch poem (Middelnederlands, also called Diets), ca. 1400, Hulthemse handschrift:
http://www.dds.nl/~ljcoster/lanseloe/lanseloe.html

Lanceloet en het Hert met de Witte Voet, Dutch poem (Middelnederlands, also called Diets) 14th century, Haagse handschrift, author might be Lodewijc van Velthem:
http://www.dds.nl/~ljcoster/lanceloet/lancelot.html

The Mabinogion consists of many tales. Arthur is present in Culhwch and Olwen, The Dream of Rhonabwy, Owain or The Lady of the Fountain, Peredur son of Evrawg and Geraint and Enid. (Some of these stories are different versions of Chrétiens poems):
http://www.cyberphile.co.uk/~taff/taffnet/mabinogion/mabinogion.htm

Malory's Le Morte Darthur:
Complicated address, but this link works

Selected poetry of Tennyson including The Lady of Shalott:
http://www.library.utoronto.ca/utel/rp/authors/tennyson.html

Tennyson's Idylls of the King:
http://ops.tamu.edu/x075bb/poems/mortedArthur.html

Mark Twain's A Connecticut Yankee in King Arthur's Court (etext):
ftp://uiarchive.cso.uiuc.edu/pub/etext/gutenberg/etext93/yanke11.txt

Galleries:

Arthurian Images, the variety of interpretations in images rather than words:
http://www.angelfire.com/al/lancelot66

The Tristan stained glass windows for Harden Grange, by William Morris & Co.:
http://www.angelfire.com/al/tristanglass

Medieval and Arthurian images, nice pages:
http://nouveaunet.com/prbpassion/med1.htm

Arthurian gallery:
http://www.uidaho.edu/student_orgs/arthurian_legend/gallery/gallery.html

Edwin Austin Abbey's Boston Library Murals
http://etext.virginia.edu/railton/yankee/abbey.html

The Arthurian legend in visual context (It is a pity that most of the images are BW).
http://www.millersv.edu/~english/homepage/duncan/mideng/students/deanl/gallery.html

Pre-Raphaelite brotherhood:

Pre-Raphaelites:
http://persephone.cps.unizar.es/general/gente/spd/pre-raphaelites/pre-raphaelites.html

Pre-Rapaelite collection:
http://www.pre-raphaelites.com

Exploratory and creative Pre-Raphaelite pages:
http://www.walrus.com/~gibralto/acorn/germ/

Dante Gabriel Rossetti archive:
http://jefferson.village.virginia.edu/rossetti/rossetti.html

Just about every Pre-raphaelite link:
http://www.dlc.fi/~hurmari/preraph.htm

Pre-Raphaelite images of the Middle Ages:
http://www.xs4all.nl/~kite/Excalibur/prer.html

Women in the Arthurian tradition:

Page devoted to Guinevere, also called Guenevere:
http://www.legends.dm.net/kingarthur/guenevere.html

A thesis about the changing role of women in the Arthurian legend:
http://www.collver.pagemakers.net/AThesis.htm

Essay: The role of women in Sir Gawain and the Green Knight:
http://www.shss.montclair.edu/english/furr/arkin.html

Morgan le Fay's fairy page, quite "misty", but nice design:
http://home-2.worldonline.nl/~haverk/

A new novel about Guinevere called Dawnflight (I have not read it, but the reviews seem positive):
http://www.monumental.com/headlee/dawnflt.htm

Wagner:

In-depth site (in German) on Tristan und Isolde. The complete libretto and a classification of the motifs:
http://www.cis.upenn.edu/~josephr/TuI/home.html

Everything (and I do mean everything) on Wagner's Parsifal (click on the black box where Pasifal is written in gold to get to a lot of articles on the opera):
http://home.c2i.net/monsalvat/indexns4.htm

The libretto of Parsifal:
http://home.wish.net/~kiar/wagner/libretto/parsifal.htm

Tristan und Isolde: het kunstwerk en de ethiek. (Dutch thesis about the ethics in Wagner's opera):
http://www.tte.nl/wijsneus/scripties/tristan.html

Parsifal, I think it is the Wagner version, retold by Joseph Kerrick:
http://home.jps.net/seek/Parsifal/

Arthurian film:

Kevin Harty's extensive bibliography on Arthurian film. As far as I can see it is completely complete:
http://ub.rug.nl/camelot/acpbibs/bibhome.stm

Arthurian animation:
http://www.lib.rochester.edu/camelot/acpbibs/toonbib.htm

Quest for truth in the cinema. Look for the piece about Robert Bresson, director of Lancelot du Lac:
http://www.hal-pc.org/~questers/HOME.html

Bresson's Lancelot du Lac reviewed:
http://filmsociety.wellington.net.nz/Lancelot.html

About Bresson:
http://www.sensesofcinema.com/contents/00/3/bresson.html

Swashbucklers at the Round Table:
http://www.xs4all.nl/~kite/Excalibur/swas.html

Essay on Indiana Jones as a modern Arthurian hero. Interesting, although some of the arguments seem a bit forced:
http://users.ox.ac.uk/~arthsoc/Cauldron/indiana.html

Monty Python and the Holy Grail, the script:
http://www.mzonline.com/python/

First Knight:

The First Knight page, photos and trailer:
http://movieweb.com/movie/firstknight/index.html

First Knight photos:
http://www.hollywood.com/movies/knight/photo/index.html

First Knight review:
http://www.filmscouts.com/reviews/fir-kni.html

First Knight, analysis:
http://www.xs4all.nl/~kite/Excalibur/firs.html

John Boorman's Excalibur:

The Charm of Making disentangled
http://www.sfs.nphil.uni-tuebingen.de/linguist/issues/4/4-87.html

Excalibur page:
http://dandalf.com/dandalf/Excalibur%20the%20Movie.html

Sounds from Excalibur
http://moviesounds.com/excalibr.html

Misogyny in Boorman’s Excalibur. Well written, but the argumentation is far fetched: "Boorman’s grail is not a holy object. It is a symbol of gendered power":
http://www.malory.net/knyght3.htm

Excalibur, the stuff of future memory:
http://www.xs4all.nl/~kite/Excalibur/exca.html

Tristan and Isolde:

Heraldic symbolism in Tristam and Isoud:
http://pages.ripco.com:8080/~clevin/tristram.html

Translation of the Carlisle Fragment of Thomas's Tristan and comparison to the corresponding sections of Tristrams Saga and Sir Tristrem:
http://web.clas.ufl.edu/users/jshoaf/Carlisle.htm

Here you can find links tot The Romance of Tristan and Iseult, as retold by Joseph Bedier and Swinburne's poem Tristam of Lyonesse as well as other obscure but in some cases interesting stuff
http://www.crosswinds.net/~obscurio/

The Tristan stained glass windows for Harden Grange, by William Morris & Co.:
http://www.angelfire.com/al/tristanglass

Le Roman de Tristan, Béroul's verison, original text:
http://cedric.cnam.fr/cgi-bin/ABU/go?bertris1

A Tristan and Iseult page, mostly links to other sites:
http://www.legends.dm.net/kingarthur/tristan.html

Prince Valiant:

Prince Valiant - Hal Foster:
http://www.comic-art.com/bios-1/foster01.htm

Another one: Prince Valiant and Hal Foster:
http://comics.cro.net/e-pstrip.html

Robin Hood:

Robin Hood, everything you need, info, texts and so on:
http://www.ub.rug.nl/camelot/rh/rhhome.htm

Robin Hood, texts:
http://www.sla.purdue.edu/medieval-studies/

Miscellaneous:

A book report (in Dutch) about Koning Arthur written by Jaap Ter Haar:
http://www.okidoki.com/homework/o-boekverslagen-hj.htm

Here one can hear what Middle English sounds like. Excerpts from Gawain and the Green Knight and The wedding of Sir Gawain and Dame Ragnell:
http://athena.english.vt.edu/~baugh/Medieval/indexof.htm

Informative site (annoying audio though):
http://www.celtic-twilight.com/

Go back in time and become a knight at Camelot Castle or get a taste of the artistic Arthurian experience of others:
http://www.camelotcastle.com

Arthurian landscapes; Tintagel, Cadbury Castle, Glastonbury Tor and other places relevant to the legend. Photos by Nicola:
http://www.geocities.com/EnchantedForest/Cottage/4304/arthursrealm/

Interactive Arthurian syllabus. Fun and education in one. Quite a lot of clips from Arthurian movies to be found here:
http://www.smu.edu/~bwheeler/kinga/syllabus.html

King Arthur: a man for the ages. Good pages, interesting for Arthurian ignorants as well as scholars:
http://www.geocities.com/CapitolHill/4186/Arthur/htmlpages/kingarthur.html

Camelot In Four Colors, A Survey of the Arthurian Legend in Comics:
http://camelot4colors.tripod.com/index.htm

The discussion group Arthurnet:
http://www.clas.ufl.edu/users/jshoaf/Arthurnet.htm

And the archives of Arthurnet; here you can use keywords to search through previous discussions:
http://lists.mun.ca/archives/arthurnet.html

An Arthurian FAQ:
http://arthurpendragon.ukonline.co.uk/artfaq.html

American Library Association (ALA) travelling exhibition "The Many Realms of King Arthur"
http://www.ala.org/publicprograms/king/king.html

The Quest for the Holy Grail disguised as a quiz. I made it quite far, but failed to answer the last question:
http://www.virtopia.com/Quest/Grail/

List of Arthurian literature, in chronological order
http://www.thinkage.on.ca/~dat/arthur.html

Arthurian literature for children and young adults:
http://web.utk.edu/~etsulliv/arthur.htm

Extensive Arthurian pages (genealogy, characters, stories and more), in French and English:
http://www.mygale.org/03/pfv/

If you speak Portuguese, here are the Arthurian pages for you:
http://www.geocities.com/area51/shire/2332

The Camelot Courier. It shows how established Arthurian names and reputations are in our society and popular culture:
http://www.english.udel.edu/rewa/

Heroic age, magazine online:
http://members.aol.com/heroicage1/homepage.html#The Heroic Age Homepage

From the Camelot Project: Taliesin's successors: Interviews with authors of modern Arthurian literature by Raymond H. Thompson:
http://www.ub.rug.nl/camelot/intrvws/contents.htm

Lady Pendragon: cartoons (I am not sure hat to think of this)
http://www.ladypendragon.com/base.htm

Two Arthurian plays for kids (7-14) here. It is a pay-site, but you can get a free sample.
http://www.pacificsites.net/~kidsplay

A basic reference guide to accompany "Teaching King Arthur in the 90's" a one-day seminar for middle & high school teachers held at the University of Connecticut (Storrs):
http://home.att.net/~torregrossa/

Other Arthurian links pages:

Before Malory:
http://www.catawba.edu/dept/history/arthur1.htm

Malory to Twain:
http://www.catawba.edu/dept/history/arthur2.htm

Modern times:
http://www.catawba.edu/dept/history/arthur3.htm

And another page with a lot of Arthurian links:
http://www.mythsearch.com/arthur.html