In a previous post I summarized a paper using two programs: Prezi and Screencast-o-matic. Both are free and easy to use. The screencast above shows how I did it. Anyone can do this.
I did this on a mac, so I used the earphones/microphone that came with my iPhone. The sound is not the greatest, but good enough I think.
The screencast is 9 minutes long, which might be too long. It's hard to strike a balance between detail and the big picture. Hopefully, I will improve with time. Feedback is very welcome.
Update: be sure to check out the comments below