Have played with a free screencasting software the other night - very easy to use and might be a good feature to add to sites - e.g. how to use CMS etc etc. or even front end stuff
The software I've used is http://www.camstudio.org/ more info here: http://www.screencast.be/
It does audio too (not tested) and can export to Flash or avi.
There is an example here (use Internet Explorer I think there is a trivial bug in the auto generated embed script for Firefox)
The example is clearly a bit long and the file size is too big but serves as an illustration.
Anyone played with any other screen casting software?