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.
Some of the features include
5 snapping modes
Fast picture viewer with support for BMP, JPG, PNG, TIFF, PNG and GIF output formats
Supports Hotkeys, copy to Clipboard, printing, autosave and autoprinting
An auto-extending list of fixed sizes, perfect for snapping images for icons and glyphs.
A zoom tool for magnifying selected parts of the screen
A color picker showing screen colors with separated RGB parts
Adding frames and mouse pointer images
Multilevel configurable undo and redo
Click here to download MWSnap. MWSnap works in Windows 7, Windows Vista and earlier. Installation is easy. Simply run the downloaded EXE file and follow the onscreen instructions to complete the installation.