Classical Literature: Tragedy, Lyric Poetry, New Comedy, Satire, Epic Poetry...and Much More
http://www.ancient-literature.com/index.html
Includes information about Euripides and a summary and analysis of Hippolytus, as well as general background about classical literature.
Euripides
http://www.theatredatabase.com/ancient/euripides_001.html
A biography of Euripides, as well as a number of links to other resources.
Euripides, Hippolytus
http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.01.0105
Hosted by Tufts University, this website features Hippolytus in the original Greek with side-by-side translations by David Kovacs.
Euripides Index
http://www.theatrehistory.com/ancient/euripides.html
Includes numerous links to primary and secondary sources on Euripides.
Project Gutenberg
http://www.gutenberg.org/etext/8418
The full text of Hippolytus and The Bacchae, translated by Gilbert Murray, on Project Gutenberg.