I'ved used it since like '03, I think. They have newer versions but as always it's just filled 'em with unnecessary crap (alerts after shots etc). This was the best version IMO.
Way more simple than the regular printscreen method and as you can see from the screenshots I posted, it gives you the options of just capturing certain areas of the screen, active window or the regular fullscreen.
Also saves directly to a picture file (just check the "file" box under the "copy captured images to" section shown in the 2nd screenshot in the other post) so you don't have to open MS-Paint or any other program to paste, save & whatever else.