Using Knowmia to help create
You'll want the iPad app and an account at www.knowmia.com
Knowmia allows teachers to either create or simply post lesson videos that you have created using other apps or software. I have used the iPad app version to create lessons and posted them to the web on www.knowmia.com. I have also created videos using programs like Camtasia and then posted them to www.knowmia.com. Students and peers can view the lessons on the web with a link that I provide or by browsing Knowmia's list of posted work. The iPad is a workable free substitute for doing screencasts (including your face via webcam). Check out a sample lesson at http://goo.gl/1mj58c. Please don't judge...it was my first lesson!