Ovid - "The Metamorphoses" A Complete English Translation and Mythological Index
http://etext.virginia.edu/latin/ovid/trans/Ovhome.htm
A very clear and precise translation with line equivalencies and hyperlinks to the index.
The Ovid Project
This project, sponsored by the University of Vermont, makes accessible an extraordinary number of illustrated works of Ovid, including many engravings of scenes from the Metamorphoses.
The Perseus Digital Library's Collection of Greek and Roman Materials
http://www.perseus.tufts.edu/cache/perscoll_Greco-Roman.html
This incredible and reliable site provides Latin E-text and translations of a large number of classical works (including many of Ovid's). It also provides links to a number of secondary texts, overviews of Greek and Roman History, and many useful tools and lexica for exploring classical texts and understanding language. This site is invaluable to anyone studying ancient Latin or Greek.
Mythography
http://www.loggia.com/myth/myth.html
An interesting site which devotes itself to exploring the myth and art of a variety of ancient cultures. The site summarizes myths, provides biographical information on Greek and Roman writers, poets and artists (including Ovid) and provides other assorted resources surrounding myths and culture in general.