You may have noticed a "ScreenCAST" icon appearing next to the existing entries for HTML markup in the posting form. This icon allows you to record a screencast. It requires Java to work and should work on both PCs and Macs.
I have attached on a very basic example screencast to this posting. New screencasts are processed every two minutes. Until that time, it will say that the screencast is pending.
Once screencasts are in your library, you can attach them to other posts. This will allow you to record a tutorial type screencast and use it over and over again for similar questions.
Please let me know how it works!