The shareware/freeware developers at La Jolla Underground have updated
See No Evil, a utility that hides your screen with the click of a mouse or a user-configured hotkey, to version 1.1.
To use it you can simply click a floating button, and your screen will be hidden. Move the mouse or tap a key, and your screen will be revealed. Command-drag the floating See No Evil button to move it around.
Version 1.1 adds a new “hide all but Finder” action and two configurable hotkeys. There’s a new preferences window for configuring mouse/hotkey modifiers and actions. It runs on Mac OS X or Mac OS 8.6-9.x (with the CarbonLib 1.2.5 or later extension installed).