Two video's, both started out as VHS tapes and a friend made them into dvd's with several copies.
Handgun safety by Jeff Cooper, I give copies of this to people I like and want to shoot with but their gun safety sucks. No one's shot me yet after watching it!
Mastering the mental game by Lanny Bassham, at some point usually within the first couple of years every competitive shooter realizes they have the mechanics of shooting mastered, they have advanced beyond beginner and plateaued unable to advance any further, this video could help them break down the mental barriers most people put up in front of themselves.