What free program does everyone use to record what their doing on their computer screen?

I’m not looking for the print screen button, I need to take a video of myself using Adobe Photoshop for a training video I’m making for a Digital Imaging class. I heard a few free programs were around, but have yet to find any.

HyperCam

http://www.google.co.in/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fhypercam.en.softonic.com%2F&ei=mar6R9qmCo3gswKfraisAg&usg=AFQjCNEOmFIlqY7e6Zn8jCPgczH8SyE1Wg&sig2=KnIk7-5rCYtkFfniBNs2HA

Download and Enjoy

Happy Yahoooooooooooooooing

Computer: Basic computer skills course: Video Training (1 of 24)