http://www.digitaljuice.com/djtv/default.asp has some videos with tips
for making better videos. The best ones for high school students are
the Take 5 series and the Production Notes series. Digital Juice is a
company that produces many types of software and tools for video
production, but these short tutorials are entertaining and can help
teachers or students create better videos to use for instruction or as
projects. Take 5: I've Been Framed! and Production Notes: Green
Screens & Ham are two of my favorites to show my students.