MultiScreenDump is an easy to uses stand alone software for creating screen captures.
Tested on Windows 2000 and Windows XP but is likley to work on other versions of the Windows platform. You can use Hotkeys to capture the full screen, Active window or a mouse defined area, or use the on screen capture buttons. Files can be saved as JPG or BMP to the directory of your choice, and a 50% preview can be displayed of the grab. Files are automatically named and numbered, so all you have to do is keep grabbing.