I have found the following sites to be excellent as information sources.
This HSE site has excellent information in video format on a huge number of safety topics. http://www.hse.gov.uk/resources/videos.htm
The following site from the US Chemical Safety Board has a huge selection of Chemical Safety Related Videos. Excellent Site
The following site gives free pictures for use in the preparation of Safety Training Courses
The following site is excellent for Tool Box Talk information
I constantly update the best site list. Visit whenever you want to see the most recent best site list.