If you want to do screen pics or screen capture video, then check out the Jing Project.
From the Site: “The concept of Jing is the always-ready program that instantly captures and shares images and video…from your computer to anywhere.It’s something we want to give you, along with some online media hosting, to see how you use it. The project will eventually turn into something else.”
p.s. There is a download for both win/mac.