I recently got a question from a teacher about recording mathematics explanations using a Bamboo from Wacom. I have never used a Bamboo before, but I know people who have and I've seen other tablets like it, so I knew what this teacher was asking. When using a Bamboo, you project your computer on the screen using a digital projector, and the tablet is essentially a big mouse pad that lets you draw or write with a stylus. I have used similar tools before, and there is no projection on the tablet itself. You can just see your marking on the computer or projector.
Since the computer is the "brains" for the Bamboo, rather than an app on an iPad or other tablet, Bamboo users must use a program that runs on their computer. To my knowledge, the are not many computer programs that function as a whiteboard AND let you record your explanation. One would have to use a whiteboard app concurrently with screencasting software. This may become more trouble than it's worth, in my opinion. There is, however, a web tool called Educreations that works as a whiteboard that records pen strokes on a virtual whiteboard. The developers really push the iPad app, but there is a web component to it as well. I have used it with my students, and it works pretty well when there is no iPad available.
Using this tool, the teacer would project the browser page using the computer, and the Bamboo would be the writing tool. I wanted to walk myself through the process and recorded a demo, seen below (Note: I am not using a Bamboo; rather, I am remotely accessing the screen from my computer on my iPad using SplashTop. The iPad is acting like a Bamboo ... complicated, I know.)
The teacher to whom I was explaining this process bought his own Bamboo and teaches in a school devoid of many technological tools other schools have access to. My goal was to point him to something free that offered most of the things he wanted to do. Conceptually, this teacher understands the value of digitally recording complex explanations to students. He can go back and revisit old problems without having to rewrite them on the board, and since the entire explanation is recorded the students can watch it later when they are working independently. I tip my hat to teachers like this who catch a vision and seek out information to make it happen given the resources they have access to. iPads and other tablets are slick, trendy, and honesty, quite powerful, but they are not the only way to implement innovative teaching strategies with technology. No matter what the tool, there is no replacement for persistence and creativity.