Most students used screencast-o-matic, which is both free and relatively simple. Students who possessed more advanced tech skills, or those who were more heavily invested in their projects, were given the chance to use Camtasia Studio along with quality podcasting equipment.
Here is a screencast as part of a PHS student's 20 Time project. He is learning how to do voice-over productions for his project, so he offered to provide narration for my "20 Time Intro Presentation." I think he did an excellent job!