Places I visit frequently...

Audio Engineering

Brian the Techie: Basics of Micing a Cast

Soundhire: Attaching Microphones for Theatre Use

Shure: How to Control Feedback in a Sound System

Sweetwater: How to Mic a Drum Kit

The Small Venue Survivalist: Why Audio Humans Get So Bent Out Of Shape When A Mic Is Cupped

Set Construction

Theatrecrafts: Glossary of Technical Terms

Willsnook: How to Build a Revolving Stage

ia470: Platforms, Parallels, and Stairways

Photography

Jim Grey: Down the Road

Japan Camera Hunter: The Unsung Heroes of 35mm Photography