How to record a video of computer screen movements Can someone suggest good softwares for making a video tutorial of computer screen, like is done on most computer tutoring sites?

I am looking a software that can capture a video of my blackberry simulator run so that the client can preview the look and feel of an app on the device.

Please suggest software that is freely available and which doesn't add any watermarks.
I love using Camstudio!
It's free I've used it , not the best interface but great to use until you are willing to pony up $300 for Camtasia.

http://camstudio.org/