The Importance of Being Earnest
http://www.hoboes.com/html/FireBlade/Wilde/earnest
The full text.
History
http://www.nyu.edu/library/bobst/research/fales/exhibits/wilde/00main.htm
An extensive site that commemorates the 100th anniversary of Wilde's trials, there are short essays on Wilde's work and life.
Audio-text
http://www.oscarwilde.com/wilde.html
Site for the 1997 movie "Wilde," including audio readings of his work.
Wilde, Society, and Society Drama
http://www.english.upenn.edu/%7Ecmazer/imp.html
An account of the opening night of The Importance of Being Earnest.
The official Oscar Wilde website
http://www.cmgww.com/historic/wilde/index.php
With an introduction by his grandson.