creating materials for online courses

To have a 2 or 3 hours of live web course sounds high risk to me
What happened the network was interrupted?
It bound to happen.

So, I think it is important that I develop some lecture movies so students could watch whenever they like. Camtasia costs $129 education price. Then someone pointed me to camstudio 2.0 - http://www.camstudio.org/ Maybe the functions are not as fansy as Camtasia, but initial try worked just fine. Not sure how to do editing afterwards (such as cutting out bad segments). Adding screen annotation did not seem easy at this point. We will see. It is opensource. Do not complain.