Record PowerPoint Movies - Explain EVERYTHING with Explain Everything!
Much like 30 Hands, Explain Everything is also a very handy tech tool that gives you the ability to import Powerpoints and record them as a movie.
I actually prefer this tool and have been known to record presentations while driving... although I definitely DO NOT recommend that. :)
Additionally, this is an interactive whiteboard. You can draw on worksheets, diagrams, etc, record a voiceover and explain details to your students in a short video you produce.
Very easy to use on your tablet or smart phone!