Jorge

I've watched this thread with interest for two reasons.

a) I also teach at a college, biology and environmental science
b) I am helping to develop a Linux distro.

a) I've used record my desktop in Ubuntu and it worked ok to illustrate my own rather doofus attempt to illustrate "the succession of plant communities"(changing from moss and stuff to trees etc. over time.) But there was a lot of data loss so the discussion has given me some new ideas on apps.
b) I made a "video" of our distro last year and posted it to youtube but thought that the normal "record my desktop" lost some data and spent the money to go to a "professional" guy who had such capabilites and he did a bangup job, but there was still a lot of data loss. So, again, I'm going to try with these and see what happens.
Sooooo, the mention of these apps, and especially the web app you mentioned has opened up some new possibilities.
I know that I haven't furthered your question, but just thought I'd comment that it has helped me!
woodsmoke