A list of screencasting tools (because of this post). Please comment to suggest additional tools or provide feedback on these.
Issues to consider:
These are in approximate order of overall usefulness as judged by me, most useful on top. Anything that isn’t free isn’t very useful for this purpose!
Applet-based. Free (up to 15 minutes, watermark added), paid option available. Windows, Mac and Linux. Seems very solid. Might be awkward to have to stop and wait for file to save every 15 minutes.
Applet-based. Free (only 5 minutes at a time). Windows and Mac. Not tested by me. No linux. Very short recording time.
Download-based. Only 5 minutes at a time (even paid version). No linux. Very short recording time.