Take screenshots even of games and save them automatically, with PrintScreen Plus
PrintScreeen is a freeware with advanced features for taking screenshots.
PrintScreeen builds upon the idea that produced the PrtScn button on PC keyboards, although it will give you more hotkey options.
It can take a screenshot and save it automatically as a file in a certain location; it can send the screenshot automatically to Paint; it can take screenshots of games during play time, and it can also take screenshots of animations at an interval of ~10 frames per second.
Option to save as jpg, bmp or png. Option to play a sound, run hidden, start with Windows.