I wanted to record a Screencast for some demo. I tried this free app "Hypercam" and liked it.
Click on the below link to see how can you make a video clip of your computer screen without using the webcam or camera.
Note- The tool will install a new plugin to your browser (even-though you had selected no during the install options) . If you do not like the plugin then go to your browser tool-menu and remove it.