Other
Children's Theatre: Creative Drama
A playwright's website that explores various aspects of children's theatre. Includes definitions, lesson plans, books and plenty of ideas.
Other
Tct Webstage: Theater Glossary
TCTWebstage.com offers a theater terms glossary. While admittedly not an exhaustive list, you'll find explanations of most common terms, from Above to Youth Theater.
Canadian Theatre Encyclopedia
Canadian Theatre Encyclopedia
This search engine is great for beginning lessons, brushing up on basic info, or as a reference for student projects.