A screencast is a movie that captures the display from a computer screen, along with narration about what is being shown. Typically, this takes the form of a formal narrated Powerpoint presentation or demonstration of a particular software program or concept. (An Introduction to Screencasting, http://www.techsoup.org/ )
Professor Ray Sarnacki (Management) uses these tools to create short tutorials for use in his MBA classes. He posts the tutorials online, for students to access at their convenience. Professor Sarnacki has experimented with three different screen-casting tools in this process: Wimba (included in Live Classroom in Blackboard) , TipCam and Jing. Each has benefits and drawbacks. Click here to access his presentation which discusses each product, compares/contrasts them, and includes links to tutorials he has created using each.