Today I derived the Quadratic Formula for my students in class. I promised them I would do some sort of pencast later and post it, so I told them not to take notes on it.
I ended up using my eInstruction Mobi and pen to write on the Interwrite Workspace software. Interwrite Workspace is also from eInstruction, and it has a built-in tool to record video and audio! It worked really well! I love the fact you can see color and also my mouse movement, in case I want to refer back to something I already wrote.
The software saves the video as a .avi file, and so I uploaded it quickly to YouTube so my student could access it easily. I also posted a link to the video on my website.
I am really enjoying having a variety of tools available to use to record part of a lesson or to write examples that I want my students to view again later when they are working on their homework.