TheOffButton is an enhanced version of Caracolix Lights Out.
It also let you turn your computer's Monitor Off directly from the screen by pressing a button.
This - some times - is more convenient than using the monitor's switch and much better than any screen saver because when the screen is off it can't burn itself nor waste energy.
This program is not free - due to a variety of enhancements.
It features:
Much smaller interface than the free version.
It comes with two button types which can be interchanged at any time.
Background color can be changed to match the monitor screen in Frame mode.
Button color can be changed in frameless mode.
It can be set to appear on top of any other application.
It can be moved to any place on the screen.
It can be configured to avoid false movements from an input device to switch back-on the monitor by slights movements.