What is Jing?
Jing is a screen capture tool (picture or video, with or without audio).

How to Start
Video tutorial
The Quick and Simple Version
  1. Download, install, and run Jing.
  2. Click the capture button, and select something on your screen to share.
  3. Choose to grab an image or record a video.
  4. Edit your image or preview your video.
  5. Hit Share to upload your file to Screencast.com. The URL is copied to your Clipboard.
  6. Paste the URL into your conversations or anywhere else you want to share.

Examples of Jing Projects
Shelley Paul's Flickr Creative Commons/Wiki tutorial