There are a few free publications out there, too. So here are some good resources that won't break the bank:
American's with Disabilities Act (commonly known as the ADA):
Occupational Health Safety Administration (OSHA):
National Institute for Occupational Safety & Health (NIOSH):
(Great ladder safety info here!)
And with a big thank-you for the United Kingdom government:
This is a set of Fire Safety Risk Assessment Guides that clearly and logically cover many different types of performance venues. They may be metric (oh, the horror!) and they may be formatted on funny sized paper, but doggonit, these are good guides!