From Wisdom Software:
ScreenHunter is a free screen-capture tool for you to easily take screenshots. ScreenHunter can capture a full screen, an active window, the client window, or a rectangular area. It automatically saves captures in BMP or JPEG format, so you don't have to stop each time you capture, and you can capture as many as you like. It also can save captures to the Clipboard to be copied to other programs, such as Motion Studio and Word. ScreenHunter has a selectable hot-key capture (F1 to F10) and delayed capture, and uses virtually no system resources on standby.