yeah, open in either Photoshop or Fireworks (and possible some other image editors) and press the "Print Screen" keyboard button, then in the image editor choose "File->new" and you'll see that the dimensions for the new file automatically are set to your screen dimensions (ie, typically 800x600 or 1024x768). Then once you've created the new blank file of that size, just choose "edit->paste" and you've got your screencapture.