If you need a good and easy-to-configure tool to enhance the printscreen capability (eg. to capture some DVD’s printscreens), Gadwin is not bad:

There are several hotkey combos to choose from (PrintScreen is the default). Once you’ve chosen your favorite combo, head to the Destination tab and have the screen print out instantly, copy the capture to the clipboard, save it to a specific folder, or even send it through e-mail. You can perform full screen captures, or only capture a specific window.

Gadwin PrintScreen is an easy to use freeware utility that allows you to capture any portion of the screen, save it to a file, copy it to Windows clipboard, print it or e-mail it to a recipient of your choice.

There are also six different image formats to choose from, and each one can be resized.