http://elearnmag.org/subpage.cfm?section=articles&article=97-1
3. Jing
Jing, a free program built by TechSmith, has made more of a difference in my online courses than any other. It allows the user to capture screenshots or record short videos, and then share these quickly and painlessly with other people via the Internet.
In the technical fields, teaching tends to center around solving problems (chemistry, physics, math), and it can be difficult to mimic online the student experience of going to a professor's office and getting help solving a specific problem. With Jing, my students can send me a link to an annotated screenshot of a problem they are struggling with--and the work they've tried so far. Then I can respond by recording a 1- to 2-minute video with some hints, and send them a link to the video.
Once my students got the hang of using Jing, they started using it to help each other, posting questions about specific problems, and posting hints toward solutions to each other in both screen capture and video form. Here's an example of how collaboration happens using Jing (a second example is shown further down the page):
