PrintKey 2000: "PrintKey is an excellent add-on. It is activated when you press the PrintScreen Key and allows you to capture the entire screen or any portion of it. You can then make changes to the screen capture and save in a variety of formats including .gif, .bmp, .jpeg, .jpg, .emf and .wmf. You can also swap colors, convert to grayscale or black and white, change picture size and send to the printer all from this little freeware program."
Capture: Capture is a quick-and-easy screen capture utility for Windows (and NT), which allows you to capture the entire screen, at any color depth and resolution, and save it into a Bitmap file for editing.
Grabzilla: Grabzilla lets to capture the whole screen or just parts of it and save the result as a JPG, BMP, GIF image.