From the devloper: "Screenshot Utility is a screen capture program. It resides in the system tray, and when you press a hotkey combination, it captures and saves a snapshot of your screen to a JPEG, GIF or BMP file. You can define your own hotkeys, choose default path for saving files, select area to capture (entire screen or active window) and set message or sound alerts."

Note: This is a 30-day trial; shareware registration is $17.