Along with recording lessons, the tools can be used to record additional lessons for to review later or if you have centers created with different tasks at each center. An excellent way for differentiation.
I have used both Jing and Screencast-O-matic. Both are great tools; however I love Screencast-O-matic direct updates to YouTube and Drop box.
I created a screen cast below and included part of one of the screen cast lessons I did last year.