Related Links
(Please let us know of more!)

Properties
PropPeople.com  The Online Home for the Prop Professional.
PROPTOLOGY The Journal of Props Professionals.
Theatre House, Inc. You name it, they have it.
Theatrecrafts.com - Glossary of Technical Theatre Terms.

Directing and Stage Management

Costumes

Sets/Stage
TechnicalTheater.com Has a great links section
SpecialFX liquid rubbers and plastics for special effects in Hollywood

Lighting

Sound

Scripts
Baker's Plays
Dramatists Play Service, Inc.
Eldridge Plays and Musicals
Pioneer Drama Service

Stage Fighting
American Fencers Supply Co.
Weapons Specilist Ltd.
The Society of American Fight Directors
Medieval-Ware.com
Arms & Armor