When I have the time I'd like to make some videos like this one which show how to use various library resources. This one comes from the Cornell University Olin Library and is part of their series of 90-second videos called "Research Minutes."
The topic of this video is finding substantive news articles, certainly a topic which high school students need to understand.
I like the way this video just use still pictures and screen shots, a la typical slide presentations, and a little music to convey a sense of movement and urgency. Very easy techniques to make viewing the video much more enjoyable.