Australian Catholic University - Useful discussion on realism and naturalism in the theatre, the differences between the two and the position of Ibsen's A Doll's House
Modern Drama - Article from the Modern Drama journal discussing the term 'modern drama' and exploring the background behind Zola's theories of naturalism for the theatre.
Newberry College - excellent resource examining the emergence of the realism movement in theatre, relevant playwrights, the introduction of naturalism, and the distinct differences between realism and naturalism for the theatre
International Brecht Society - A non-profit educational organization founded in 1970 and based on Bertolt Brecht's own plans for a "Diderot Society". A great place to visit and discover all things Brechtian.
Samuel Beckett On-Line - This site features the largest selection of Samuel Beckett article links on the web. Included are Brooks Atkinson's famous review of "Wating for Godot," Sir Peter Hall's reflections on directing Beckett's plays, and much more.