If you've got a lot of Windows open at once, it's a real pain to go through each one by one and minimize them.
That's why GameMinimizer offers an excellent solution via a simple application which sits in your tray ready for action at any moment. It works quite simply by minimizing every single window you've got open. Alternatively, you can use GameMinimizer to select a hotkey as the minmizer instead. Unfortunately, this is not customizable - you can only use the combination keys of WIN M or ALT TAB or just F12.
GameMinimizer is very useful in cases where you have several applications open and one of them crashes. Alternatively, it's useful as a "boss" key if you're using windows you shouldn't be in the office. However, the annoying thing is if you've got JavaApplet windows open, it doesn't seem to close them at the same time as other windows which is a bit frustrating or embarrassing depending on what you're doing.
GameMinimizer, despite the name, minimizes everything that's full screen including games, although it will leave certain things behind.