When you hovers over Jing or click on it the sun rays point to what can be done. You can capture an image or video. You can access your history of captures. Click on more to access preferences, help and to send feedback.
Some annoyances/bugs in this beta is that Jing.exe takes a lot of CPU without doing anything. Sometimes if you quickly move the mouse over Jing it stays in an expanded mode. To minimize it you have to move the mouse over it again.
Download and try Jing yourself. It's free. At least during the beta period.
To get started taking screen captures read the Jing blogpost about it.