Have you ever tried to explain to someone in an email or on the phone how to do something on the computer? You can take screenshots and that helps, but sometimes people need to see how you do things.
Try screencasting free with Jing, an easy tool to create brief tutorial content or to give feedback. With Jing you can share images and short videos of what you do on your computer.
note link for example above: http://bit.ly/tmclubinfo
Note: the screencast videos are in FLASH, which will not work on mobile platforms
note link for example above: http://www.techsmith.com/tutorial-jing-record-video.html
note links for above
http://www.techsmith.com/jing.html