Last night I was working on providing some information to a tech on MOS, and part of their request was screenshots. While I don't mind taking screenshots, it's actually a little quicker to take a screencast.
I used to use CamStudio or Wink, but now that I'm primarily using a Mac, I find that it's much simpler to use the java app at http://screencast-o-matic.com/.
Screencast-o-matic is drop dead simple to use, creates a reasonably small file, and allows you to provide more information to Oracle support with less effort. Edit: It's free for up to 15 minute long files.