"Screencasting" is a term that describes a video capture of your computer's screen.

CamStudio
Free, open source software for PCs that gives you the ability to create movies (AVI and SWF files) of your desktop. Use this to create tutorials for your students!

Jing Project
An intriguing new product that is free "for now"! the Jing Project is a download for PC and Mac that seamlessly captures video shots of your desktop with your voice OR captures images of your screen that you can annotate with text and arrows! The videos/images are automatically uploaded to the Jing server and you are provided instantaneously with a url that you can paste into Blackboard or an email. Great potential for teaching and learning. Consider this, encourage your students to use Jing to demonstrate concepts or ask questions and then send you the link!

Snapz ProX

Brought to you by Ambrosia Software, this product is for Mac users. It's not free but the snappy interface and ease of creating quick screencasts is worth the $69. Check out the website for video tutorials and demos.

CamTasia
A great software program available for PCs only that provides a simple way to create screencasts and video lectures in all types of video formats... even for iPod!