Jing is a screen capture application that allows you to select and capture parts of your screen and save that area as a static picture or even a movie.
Then you can add arrows, text and box highlights to draw further attention to the area you want to highlight.
The thing that makes Jing unique is that it has a "share" button, which allows you to share the image or video with a friend by connecting to the free screencast.com image hosting solution. Click share, it uploads your media behind the scenes, and places the link to the screen in your clipboard. You can then email or paste that URL into your chat application for your friends to see.
M A V I C Downloader beware. Software is listed as "free" but requires you to sign up for an account on a web site. They have a long TOS which includes:
"you grant to TechSmith a non-exclusive, royalty-free license to use, copy, distribute, and display that content." (Version 1.4.4200)
JSLMG This app is not working for me. It saves files as .swf by default. However, my RealPlayer freezes when trying to load the video, and I have to force quit it. (Version 1.3.2913)
HEDGELAND Excellent, excellent program. The easiest way I've ever seen to do screencasting, Mac or PC. And the ability to either save locally or upload instantly to their web hosting service is just awesome. (Version 1.3)