Capture a Screencast with a Mac
http://www.digital-web.com/articles/mac_screencast_capturing/

Jordan, Miraz
Digital Web Magazine
2007

Abstract:

While putting together a good tutorial movie for your blog or for an article you’re writing requires some thought and preparation, and would benefit from extra time spent on post-processing, the good news is that capturing screen shots and screen movies can be done inexpensively on a Mac. Although I take a glance at the wider context of preparing an entire tutorial and give you some tips along the way, my focus here is on the low-cost software you can use.