Dont know if anyone will have any use for this, but it is a pretty cool tool to hide open windows with the click of a single key on your keyboard.  Its called Boss! and you can check it out here.
http://www.rohitab.com/boss/index.html

That just minimizes the windows that you have open.  Boss will not only minimize them but will remove them from your task bar so that they are virtually not detectable without going into task manager and looking for the running processes.