A practical and inspiring use of vodcasting

I teach high school science at a small international school in Busan, South Korea where 90% of our students are ethnic Korean (check out BFS here). We have a substantial ESL population. The attention level of some of these students is very low, which I believe in some cases is linked to their comprehension level. I was inspired by stumbling apon this website that used vodcasting as a way of allowing students to preview course material or revisit it. It seems to me this is a very practical use of technology that may have a big payoff for my ESL learners. The teachers used an application called Snapkast to make their vodcasts. Of course the work that is required to create these vodcasts is considerable, but at this school the high school science teachers collaborated to share the load.