SnapIt utility is a screenshot taking utility which operates with just 2 keys viz SHIFT and TILDA.
It also gives you the option to specify your own file names and also to edit the image using MSPaint.
This is a simple yet intelligent utility, resides in your Notification Tray area, and takes care of issues like relaunching and remembering settings after reboots, duplicate file names etc
This utility is compatible with Windows 7 & Vista too.
Incidentally, there is also another nice utility they make called Boot Timer, which helps you time your PC boot time. If you’d like to share your Windows 7 or Vista boot-time, you are most welcome to share it here at this forum thread. We’d love to hear how fast or slow your PC boots.