Answers.com
Covers everything from Aboriginal to Roman mythology in encyclopedic detail.
http://www.answers.com/main/religion.jsp

Christopher B Siren's Myths & Legends
Highbrow directory of myths and legends throughout history and from around the globe.
http://members.bellatlantic.net/~vze33gpz/myth.html

Encyclopedia Mythica
An encyclopedia of myths, folklore and legends.
http://www.pantheon.org/mythica.html

Hans Christian Andersen
Read his famous stories and fairy tales online.
http://hca.gilead.org.il/

Pantheon
An award-winning encyclopedia of mythology, folklore and religion.
http://www.pantheon.org/

Robin Hood
A site dedicated to Robin Hood and his band of merry men that includes lots of tourist information for anyone planning to visit Sherwood Forest.
http://www.geocities.com/Athens/Acropolis/4198/rh/

The AFU & Urban Legends Archive
Popular urban myths and common fallacies debunked.
http://www.urbanlegends.com/

The Children's Literature Web Guide
Children's fairy tales online: Aesops fables, Hans Christian Andersen, the legend of King Arthur, Grimms fairy tales, Cinderella, Snow White, etc.
http://www.ucalgary.ca/~dkbrown/storfolk.html

The Loch Ness Monster
The Loch Ness Monster, Mermaids, vampires, Celtic legends, werewolves, Atlantis, Amityville and other stuff that is guaranteed to send a chill down your spine. Great fun!
http://www.endor.org/alianna/stories.html