Screen Commander

Screen Commander is a simple utility that lives in your menubar and provides screen blanking options at the click of your mouse.

Features:

• Blank/unblank the current screen
• Blank/unblank your other screens (while leaving the current one as is)
• Blank/unbank all screens at once

While Screen Commander works with even just one display, it is best suited to a multiscreen setup with two or more displays.