MIT: The Comedy of Errors - Scene-indexed HTML of the complete text. - http://www-tech.mit.edu/Shakespeare/comedy_errors/index.html
Literature Network: The Comedy of Errors - Scene-indexed HTML of the complete text. Summary, search feature, and author information. - http://www.online-literature.com/shakespeare/errors/
ClassicNotes: The Comedy of Errors - Summary and analysis, research links, biography, historical background and message board. - http://www.classicnote.com/ClassicNotes/Titles/comedyoferrors/