About Frank Wedekind
http://www.imagi-nation.com/moonstruck/clsc16.htm
This website, hosted by a drama bookstore, offers only a small amount of information about Wedekind, but provides links to biographies on related playwrights and Wedekind monologues from other plays, and includes a fascinating discussion of German theater.
Frank Wedekind Bio
http://www.theatredatabase.com/20th_century/frank_wedekind_001.html
Originally published in The Continental Drama of Today (Barrett H. Clark. New York: Henry Holt and Company, 1914. pp. 115-6), this biographical site provides general details about Wedekind's life, as well as several links to sites focusing on authors who were inspired by his works.
Spring Awakening
http://www.theatredatabase.com/20th_century/frank_wedekind_002.html
This essay was originally published in The Social Significance of the Modern Drama (Emma Goldman. Boston: Richard G. Badger, 1914. pp. 118-28). It contains fascinating insights into how Wedekind's contemporaries responded to the first performances of Spring Awakening. Of particular note are the large quotes from the text, which provide examples of the censorship that the play was initially subjected to.
About Expressionism
http://en.wikipedia.org/wiki/Expressionism
This site contains an excellent description of Expressionism and elucidates the philosophical theories that underlie the ideology.
Nietzsche
http://plato.stanford.edu/entries/nietzsche/
An extremely thorough and well-researched page on Nietzsche's life, writings and philosophy, useful to anyone interested in investigating Nietzsche's influence on Wedekind.