Check this out.....
Jing is another way to capture screen shots and make movies of screen activity. It's free, courtesy of the same folks who brought you Camtasia. It's cross-platform, easy to use, once you download and install, then find the icon in the upper right corner of the screen. Been using it to build a presentation for HMCO on Eduspace. I like the way you can easily add comments, arrows, highlights and boxes on the screen capture shot.