Screencasts are useful for demonstrating and teaching software features. Creating a screencast helps software developers show off their work. Screencasts are a useful tool for ordinary software users as well, to help report bugs (the movie takes the place of potentially unclear written explanations) or to show others how a given task is accomplished in a specific software environment. Screencasts are excellent tools for learning how to use computers, and several podcasts have started to teach computer users how to use software through screencasts.
Considering the high cost of instructor / faculty led training and the relative ineffectiveness of typical computer based training (CBT) systems, screencasting is likely to become a very popular technique for imparting high-quality knowledge at a low cost. For example, organizers of computer related seminars may choose to routinely record complete seminars and make them available on DVDs to all attendees for future reference and/or sell these recordings to people who cannot afford the fee of the live seminar or don't have time to attend it. This will generate an additional revenue stream for organizers of seminars and make the knowledge available to a broader audience, so generating a win-win situation for everybody.
This strategy of recording seminars is already widely used in fields where using a simple video camera or audio recorder is sufficient to make a useful recording of a seminar. Computer-related seminars need high quality and easily readable recordings of screen contents which is usually not achievable by using a video camera to film the desktop which is usually projected onto the wall by a projector.