Clarify -- now in Public Beta -- is Mango Learning System's new product for communicating screen-based instructions quickly and easily. It's something like a successor to ScreenSteps (which history will show I'm a big fan of), but in the words of developer Greg Devore, "while ScreenSteps was aimed at documentation, Clarify is aimed at communication."
Clarify provides a simple set of tools for taking screenshots, adding annotations, writing descriptions and then sharing the final step-by-step instructions you create using the free