Shannon J. Reilly, the artistic director of the Topeka Civic Theatre Academy in Topeka, KS has an interesting article on the curse of Macbeth. You can read it here
http://www.topekacivictheatre.com/blog/2008/03/27/thoughts-from-the-artistic-director-why-is-macbeth-cursed-anyway/ What's most interesting to me is that Shannon is an artistic director who does not believe in the superstition. Now that's a rare find! Their production of Macbeth closed yesterday. Coming up next they have Noises Off (May 23-June 14) and The Producers (July 11-August 9)