Visit the Campaign to Prevent Falls in Construction at:
Previous discussions about Ladder Safety can be found at:
Industrial Safety and Health (ISHN) magazine has a good article on fall prevention:
ISHN September 2013 - PPE - Serious About Preventing Falls
The following flash video provides testimony from accident victims, family members of those that didn't make it home, and provides good examples and advice about how to select and use ladders.
The OSHA web site is full of downloadable fliers, posters, training guides, and information, too: https://www.osha.gov/stopfalls/
Working in the theatre is just like working on a construction site, so treat it with respect.