Anti Boss Key - Hide windows quickly!
MindGems Inc. AntiBossKey allows you to instantly hide and restore the applications ( windows) on your screen in order to prevent uninvited persons from seeing them and to protect your privacy. There are not any adware, spy ware, banners or pop ups included in this package!
http://www.mindgems.com/software/abkinst.exe - 725Kb - Download - Screenshot

Magic Window Hider
Hide/Unhide any application/window with ease. Ever wanted to hide windows you did not want you boss/parents to see while u r working(or playing!!! ),magic windows let's u hide/unhide windows with ease. Also hides itself and displays the tilte of the hidden windows by pressing F7. ... Instructions: Press F7 to view the window's text Press F9 to hide any window (The mouse pointer should be above the window) Press F10 to unhide all windows Press F11 to hide me Press F12 to unhide me Click on the Start Hide button to begin hiding windows!!!!
http://www.pe.ws/Magic-Window-Hider.exe - 1Mb - Download - Screenshot

Anti Boss Key Light Edition - Hide windows quickly. Hide your screen!
MindGems Inc. AntiBossKey - instantly hide windows (applications) in order to prevent uninvited persons from seeing them and to protect your privacy. There are not any adware, spy ware, banners or pop ups included in this package!
http://www.mindgems.com/software/abkle.exe - 705Kb - Download - Screenshot

Hide Window Hotkey
Hide Window Hotkey is a utility which allows you to hide the windows, and programs which are running on your screen. It will instantly hide or close all (or some) programs on your screen through Mouse Hotkey or Keyboard Hotkey in order to prevent uninvited persons from seeing them. ... It also could hide taskbar and hide desktop icons. ... Hide Window Hotkey stays running in the system tray, so it stays out of your way while it works. ... At a later time you will be able to return all hidden windows back to the desktop and continue your work.
http://www.elongsoft.com/download/HWHSetup.exe - 883Kb - Download - Screenshot

SD WinHider
SD WinHider is the utility to quickly hide/restore your windows, as well as hide and restore system tray icons. Make your desktop space free for more programs! Features: * Hides/restores any window on your desktop; * Hides/restores system tray icons (like ICQ, AOL etc. ... You may use Alt+Up/Down arrows to show/hide application window; * Fast window hide (by pressing both left and right mouse buttons on window); you can turn this off in setup; * Can start with windows; * You can show/hide windows/icons just by 'turning on/off' them in interface; * You can activate manus for icons just by...
http://www2.sysdevsoftware.com/download/winhider.exe - 406Kb - Download - Screenshot

4t Tray Minimizer Free
4t Tray Minimizer lets you running applications minimized as System Tray icons, which helps in adjusting free space on your taskbar. To minimize any application to the task bar, simply left click the minimize button as usual or press keyboard shortcut. ... Desktop Enhancements: - Hides system tray icons - Launches Desktop programs from the system tray - 'Minimize to tray' and 'Hide window' buttons on the titlebar of any window - 'Minimize to tray' and 'Hide window' items in the system menu of any window Minimizing to tray: -Minimizes to tray any application.
http://www.4t-niagara.com/4t-min.zip - 613Kb - Download - Screenshot

Taskbar Hide - hide windows program
With Taskbar Hide you can fully control the taskbar. As a hide windows tool,it could hide windows program (hide applications,hide program) completely through a hotkey,also you can minimize them to the system tray instead of an icon on your taskbar. You also can change the icon and title of any... Hide any of following:taskbar,start button,task window,system tray, and time clock. ... At a later time you will be able to return all hidden windows back to the desktop and continue your work. ... Hide some of the less used icons from the system tray.
http://www.eusing.com/Download/THSetup.exe - 747Kb - Download - Screenshot

HideIt!
HideIt! is your personal data key. With its help, you can easily and reliably hide any files on your home or work PC from outsiders, and unauthorized users. Nobody except you can get access to your hidden folders and files. No one will ever know that you made some of your files invisible to... It does not matter what kind of file you would like to use as your data hiding cover, it can be a simple text document on your desktop or even any system file from your Windows folder. ... But how is it possible to hide data without any complicated actions and any professional computer skills or...
http://www.guard-software.com/products/hideit/hideit_setup.zip - 708Kb - Download - Screenshot

Quick Hide Windows
Quick Hide Windows by CronoSoft is great for hiding program windows with a press of a hotkey combination. You easily bring them back with another combo. Hiding the taskbar and desktop icons is just awesome. Password protection allows you to lock QHW to prevent intruders from trying to show... You can even lock your computer with QHW instead of a weak, easily hackable screensaver password.
http://www.cronosoft.com/files/qhw.zip - 994Kb - Download - Screenshot

ATS Warning! The Boss!
Do you need to hide windows or complete applications from the sight of others? To surf through the internet without anyone seeing the contents of the sites you have access to? To keep a conversation using a messenger or enter the number of your bank account with total privacy? ... You will be able to hide entirely applications and windows, one by one, by class or by title or all very easily. ... Moreover, you will be able to hide icons in the systray and silence your PC when you want even if you are not hiding windows.
http://www.apituan.com/dcs/Wtb160.msi - 2Mb - Download - Screenshot