Do you ever want to capture only a portion of your screen... and use "print screen", then paste it into a graphics program to select the portion of the screen you wanted to select?
I had forgotten about this tool, but now I have it pinned to my taskbar. It is called the Snipping Tool. It allows for you to select just a portion of the screen with your mouse. If you want to try it, do this:
Go to "Start" and in the "search programs and files" window just above the Start button, type Snip. Click on Snipping Tool to run it and follow the instructions... essentially, draw a box around what part of the existing screen you want to capture. There are tools that allow you to add text, highlight, e-mail, etc.
If you want this tool to be on your taskbar, after typing Snip, right click on Snipping Tool and you can select "Pin to Taskbar" or, if you want it on your Desktop, select "Send to" then select "desktop".
Enjoy!