An easy way to get started with screencasting
If you've ever thought about screencasting, but the cost of the software was prohibitive, here's a thought: try Jing!
I was at MacWorld last week, channeling my inner Apple fan girl, and Tech Smith, the makers of SnagIt and Camtasia, were there talking about the coming-soon Mac version of Camtasia. As an aside they were also showing off Jing, a free, cross-platform screencasting tool. The only limit is length: each Jing screencast can be no longer than five minutes.
As an example of how easy it is to use, here's a little screencast I made about Google Docs. It took me about (surprise!) five minutes to make, total.