The is to remind myself of the new features in Jing Pro 2.1. Firstly, hold down the Shift or Control key when dragging out a selection area to snap-to an Aspect Ratio. Secondly, the magic swop between iSight webcam and the selection area being recorded at any time during a recording. Both very nice features.

[Jing is a video and still screen capture application] available on both Windows and Mac with a free and yearly subscription Pro version. I am using the Pro version. 

Below are both the Screenflow recording and the Jing recording that was captured during the Screenflow screen capture