1)   WinBoss 1.2
WinBoss is a system tray application that hide (all) running programs with one keyboard hit. Useful when Boss is coming, or to hide less important application from cluttering the desktop.

 2)   B-Calm Privacy v1.0.40
Instantly hide what's on the screen by pressing a secret "panic" hotkey removing them from the task bar and task manager, then restore all windows later when the panic is over! Activate by secret hotkey, or clicking on a systray icon. Perfect bosskey