I bought a few items from www.firstaidstore.com a few months back. Because of this, I am now on their mailing list.
They just made a "free first aid video" available. It covers what should be found in a first aid kit and how to use those items.
In case you're interested: http://www.firstaidstore.com/t-free-first-aid-video.aspx
They also have some commercially available.