Just a quick note: The Plasma HowTo has now been updated for 4.4. With short screencasts encoded in animated GIF files, it shows how to perform common tasks in Plasma Desktop. For example:
The screencasts are small and can be played in almost any graphical web browser, at the expense of reduced image quality. Given that the screencasts are meant as HowTos and not for showing off Plasma Desktop, I think the lacking quality is acceptable (for now) considering the advantages. In the future, with HTML5 and whatnot, the format will probably be Ogg Theora.
If you want to create your own animated GIF screencasts, I have written a small guide here (updated yesterday).