I have been making videos on classroom content and processes with the ESL student in mind.  The videos usually start with a language preview (the content language of the subject of the video).  The video then shows the process or class activity which is presented by a student and subtitled.  At the end of the video there is a content and language quiz with answers to test for understanding.  If the video is loaded onto a wiki or website or onto You Tube, the student can watch the video many times, pause, rewind and so on.  The videos range from 5-10 minutes long. 

Below is another video that the Environment Club and I made to raise awareness of the issue of conservation.  The other video is also worth watching.  I found it on teachertube and it raises some thought-provoking questions about technology and our students.