It's a very practical tool to exactly delimit the area of the screen you want to capture. The SnapaShot window allows you to resize any of its sides.
SnapaShot doesn't need an installation. The result of the screenshot can be copied to the clipboard or can be saved in five different graphic formats: BMP, JPEG, GIF, TIFF and PNG.
Right now it doesn't allow you to make complete screenshots because when you try to maximize it, an area like this is out of the reach of the program.
SnapaShot requires Microsoft .NET Framework 2.0