The Internet Classics Archive: Oedipus
http://classics.mit.edu/Sophocles/oedipus.html
Most interesting for its full text of the play, in a reasonable translation by F. Storr (the superior translation remains that of David Grene in the Chicago edition).
The Classics Pages - Oedipus Tyrannos
http://www.users.globalnet.co.uk/~loxias/myth.htm
Good page with very useful resources, including another test-yourself game and some excellent revision tools.
The Eserver Drama Collection
http://drama.eserver.org/plays/classical/
Includes full texts (in differing translations) for all of Sophocles' works.
Oedipus, performed by vegetables (video file)
http://www.newvenue.com/production/1-movie.html
Funny and well-made short film of the play (cut down) performed in stop-motion animation by vegetables. Could be a useful and enjoyable revision tool.