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Camstudio is a very simple, basic, open-source screen recorder.

Pros/Features:

• It's free.
• Ability to add annotation to screen shots or video clips.
• Cursor can be enhanced or highlighted for emphasis within the video.
• Panning (zooming in and out) permitted through autopanning.
• Record the whole screen or selected portions only.
• It's free.

Cons/Caveats:

• Extremely bare-bones. No bells and whistles like those in professional programs such as those in Camtasia Studio, i.e., no way to add audio, call outs, enhanced pointer options, etc. after the fact.
• Is not a video editor. No splicing multiple multiple clips together or layering other file types (images, audio) with the original video file, other than the ability to add video-in-video via webcam.
• Special effects are extremely limited. Because it's not an editor, there is no way to add transitions, title slides, narration or background music, a table of contents for navigation (Camtasia Studio), or interactive quiz (Camtasia Studio).
• Only AVI and Flash (SWF) formats supported.
• Plan your audio recording in advance. It must be recorded simultaneously with the video. 
• Not supported on Macs (unless they can run Windows).