TechSmith has released Jing, a great screen/video capture tool that runs on both Macintosh and Windows. It has a great interface that is snappy and very intuitive. Just hover your mouse over the "sun" icon located in the corner of your screen and capture any screen shot or video to save on your computer or put out on their server. Right now the price is free although that may change in the future.
This is a great tool for those quick demonstration videos you want to include on your pages or just to get a screen shot of an error message to help solve a problem via email. Check out their own demonstration video.
When I tried out my first video capture it automatically picked up the sound from my computers mic; no preferences to set or settings to fiddle around with. It just did it. Did I mention what a great user interface Jing has! ;-)