There's a nifty little tool in Windows 7 (and, I believe, in Vista also) that makes it really easy to do screen shots. It's called Snipping Tool and can be found in the Accessories folder. To use it, you draw a cropping frame around the area of the screen you want to capture and you then have the option to save it in png, gif, jpeg, or html formats, copy it to another application, or e-mail it. It also has pen, highlighting, and eraser tools that can be used on the screen capture.