Jing is a great tool for capturing a screencast.  I have been using it for a few weeks now and it allows me to create video of what I am doing on my computer screen.  I am now creating video tutorials for my customers.

Jing is a perfect solution for tutorials that run under 5 minutes.  Jing is a free tool but they do offer a more robust paid version

Check them out:  http://www.jingproject.com/