Jing is great if you need to make quick online tutorials. Noteworthy features of Jing are:
* Record your voice narrating the tutorial
* Create a JPEG image of any part of your screen that can be labeled, annotated, and highlighted
* Immediately generates a URL to your tutorial that you can share with others or post to a website, even to Twitter and Facebook
* Both PC and Mac compatable
For $14.95/yr, you might consider purchasing JingPro. This allows you to save your tutorials as movie files that can be easily uploaded to YouTube, Vimeo, Facebook or to your own web server.
One big thing to keep in mind about Jing is that you CANNOT edit your recordings. You'd have to buy software such as TechSmith's Camtasia or Adobe Captivate to be able to edit your recordings. These programs I'd suggest you use if you're looking to make lengthier and more interactive tutorials.
But for its amazing ease of use, I'm all about using Jing!
Also check out their blog for more tips
As a huge advocate of efficiency and accessibility to creating online learning materials, I encourage you to go forth and Jing!