MWSnap is a free utility to take screenshots of your Windows Desktop. The utility itself seems to be not updated for a long time (last stable release is from 2002) but still does it pretty effectively and the features loaded onto it is almost most of what you find in new utilities not necessarily free. MWSnap allows you to screenshot fixed or any size rectangle space, a full screen, windows or a menu.
Screenshot Captor, as the name implies is a free software (for personal use) to capture screenshots of your PC. While Screenshot Captor is not the same as the those commercial software which offer highly glossy views and features, Screenshot Captor seems to stand a bit different in the way it hands back the control to the user with the level fine tuning one can do. The default settings are good to work straight out of the box while the fine tunings should definitely impress the advanced users.
Spb Screeshot is a free and simple utility to take screenshots on your Windows Mobile. Spb Screenshots works on Windows Mobile 6.x and Windows Mobile 5.x professional.
SnippingTool is one of the nice new tool on Windows Vista that I just happened to take notice today. Snipping Tool is more than the traditional Print Screen button and can allow you to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image.