Did you know of the Vista Tool “Snipping” ?

This tool makes it possible to take screenshots in a matter of seconds. Earlier Windows versions only offered a “Print” key to capture screenshots. With Vista you are able to do a custom selection anywhere on your screen to copy it anywhere.

You can find the snipping tool under “Start/All Programs/Extras/Snipping tool”
Once you opened it you can draw on your screen or do a selection with predefined forms.
Pretty cool, huh?