MacBeth Study Guide - Character and theme summaries, glossary, brief background information, and links to the text. - http://library.thinkquest.org/2888/
CampusNut.com: Macbeth - Plot summary and analysis. - http://www.campusnut.com/book.cfm?article_id=333
ClickNotes: Macbeth - Summaries and character information. - http://www.clicknotes.com/macbeth/welcome.html
ClassicNotes: Macbeth - Summary and analysis, biography, message board, background information, and links. - http://www.gradesaver.com/ClassicNotes/Titles/macbeth/