Camstudio (Free): This free, open source program is basic but effective, allowing you to capture video and audio and produce AVI and Flash movies.
Adobe Captivate ($799): Captivate is the professional level tool that has the most robust editing tools. It also allows you to make interactive quizzes and Flash presentations. This is a program that I have used to create online training applications. It might be overkill for this use, but does provide a lot of flexibility should you need it.
Screenhunter (Free): The free version of this program allows for basic video capture of your computer screen.
Snagit (Free Trial): More robust than Screenhunter, this program allows for some editing after the recording, but is only a free trial – the full version is $49.
Free Screen Video Capture (Free): This freebie allows you to capture full screen or a selected window and contains its own built-in compression program to export video in a variety of formats with some nice controls.
Koyote Soft Free Screen to Video (Free): This basic, free tool allows full screen or window capture and creates Flash movies. iPad Video Capture: For those interested in capturing the action on an iPad 2 or 3, this helpful video from MacMost Now will explain how. #KhanAcademy