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Columbus Alive Great listing of Columbus Theatre
Experience Columbus 
Catco Cool downtown Theatre
Bread and Circus Theatre Company
Little Theatre Off Broadway
Emerald City Players Community Theatre in Dublin
Davidson Theatre
Columbus Arts Council
Curtain Rising
Otterbein College Theatre Department
Ohio State University Theatre Department
Dublin Coffman Theatre Troupe
Dublin Jerome Theatre Troupe
Dublin Scioto Theatre Troupe

Audio

Theatre Sound Directory
Find Sounds Best free sound directory on the web
Live Technologies

Lighting

Stage Lighting 101
Stage Lighting Tech Pages
Association of Lighting Designers
Lighting Math Stage lighting math formulas

Rigging

Real Knots Great knots page
Tiffin Scenic

Scenic and Costumes

Character Shop Great Props Glossary
The Costume Page 
Schell Scenic
Tobin's Lake Studio

scripts

Tams Witmark
MTI
Samuel French
Dramatists Play Service
Theatre Communications Group

Other 

Educational Theatre Association
High School Tech Great Website for all things tech!
The Art of Theatre
Theatre Books
USITT Promotion Guidelines
USITT United States Institute for Theatre Technology
IATSE International Association of Theatrical Stage Employees