In addition here's a short screencasting article that shares a few different ways that teachers can use this strategy and some basic online tools.
Finally, here's a great blog post by Beth Holland that I found on my favorite Edutopia website that's titled, "Redefining Learning Through Screencasting". Ms. Holland presents a bigger picture on the impact that screencasting can have for education. As we know, providing flexible options for representation will help educators to meet the needs of more students.