Jing is free software available from TechSmith. It allows you to capture an image of what is on your computer screen (screenshot) and record up to 5 minutes of onscreen video.
Capture what you see.
Initiate a capture by clicking Jing's happy, always-ready "sun" icon...or pressing a hotkey of your choice. You can capture a window, pane, or region.
Make a point.
Need to emphasize or explain? Mark up your screenshot with a basic text box, arrow, highlight, or rectangle.
Just tell Jing where to send the screenshot and—BAM!—it's there and ready to share. When you send to a destination like Screencast.com or Flickr, Jing even places a hyperlink on your clipboard.
No need to wait.
Simply paste (CTRL-V or Command-V) the link into an IM chat, email, forum post, Twitter, anywhere...and when the person clicks it they see your freshly-uploaded screenshot. Like magic.
Download - Jing For both Mac and Windows
Tutorials - Written, video, and simulation tutorials for Jing Software.