Vista has a great tool to make Screenshots very easily. This tool is called the 'Snipping tool'.
Using this tool you can make Screenshots of your screen or a selection of it very easily.

This tool can be found at:

    * Start
    * Programs
    * Accessories
    * Snipping Tool

Using this tool you can make screenshots in several ways, for example you can make a:

    * Free-form snip
    * Rectangular snip
    * Window snip
    * Full screen snip