Screencast for Free with ScreenToaster
ScreenToaster allows you to record the whole desktop or an arbitrary rectangular area, lets you add captions, and has surprisingly excellent playback quality. Of course, its features can't match a heavy hitter like Techsmith Camtasia. It won't smartly change the cropping to the active window as you record, and there are no editing tools to trim the fat out of your video "in post." Currently, your completed video is uploaded to ScreenToaster's server, but a YouTube option is apparently coming.
If your screencasting needs are modest, ScreenToaster might be all you ever need. Don't believe me? Check out my very own ScreenToaster masterpiece, above.