Camtasia is a FANTASTICALLY easy video capture tool. So good, in fact, that you normally have to pay for it.
However, thanks to the wonders of Leonard Low's Mobile Learning blog, I've discovered (probably well behind everyone else, but hey ho!) that they've just made version 3.1.3 (?!) available on a free download. It's an excellent tool (having played around with, and got frustrated at, other video capturing services), and is how I just made the Google Reader video in only a few minutes, including playing around time!!