WinSnip

WinSnip is a utility for copying portions of the desktop to the clipboard and saving the graphical contents of the clipboard to a PNG file. This utility is activated by pressing hot keys, and provides for conveniently selecting a region of the desktop to copy.
The WinSnip utility can be also used for saving the copied desktop region to an auto-generated PNG file in the current user's temporary folder, in which case the full path to the file is placed to the clipboard instead of the actual graphical contents. This utility may become handy when preparing slides on computer interfaces, composing software documentation, or uploading pieces of graphics to the web, as it saves quite a bit of mouse clicks spent on screen copying, clipping and file conversion.

Limitations:

Limited functionality