I've used iShowU to record myself using a new skill—sometimes right after watching a video tutorial, sometimes while someone kind is showing me how to do something. (iShowU records what's happening on my computer monitor and also records sound.) So I have a little video of myself going through all the steps, with my own commentary. I've also used iShowU to make little instruction videos for a friend. They're not finished or professional videos, but it's comforting to know that I have my own little set of instructions, especially for tasks I don't do very often and tend to forget.
Note that iShowU is for use on the Macintosh. But an online search shows me that there are also several screen-capture tools available for the PC, including Wink.
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