Bullfinch’s Mythology
http://www.online-literature.com/bullfinch/mythology_fable/

Encyclopedia Mythica
http://www.pantheon.org/areas/mythology/europe/greek/articles.html

Greek Mythology
http://messagenet.com/myths/

Mythography
http://www.loggia.com/myth/myth.html

Mythweb
http://www.mythweb.com/

Myth Man
http://www.mythman.com/

Wikipedia: Greek Mythology
http://en.wikipedia.org/wiki/Greek_mythology

Windows to the Universe: Mythology
http://www.windows.ucar.edu/tour/link=/mythology/mythology.html

Winged Sandals
http://www.wingedsandals.com/