Wink 2.0, now with audio recording!
Wink is a Tutorial and Presentation creation software, primarily aimed at creating tutorials on how to use software (like a tutor for MS-Word/Excel etc). Using Wink you can capture screenshots, add explanations boxes, buttons, titles etc and generate a highly effective tutorial for your users.
http://www.debugmode.com/wink/
Get it here (Windows only, Linux will follow later):
http://www.debugmode.com/wink/download.php