CornerClick is a prefpane that allows you to assign actions to each corner of your screen. Your screen corners can act like four customizable buttons which will never move.
You can hide the current application or all other applications, and open any file or application. You can perform multiple actions with one click. Each screen corner can have many different actions based on modifier keys.
A popup window can show you what action will be performed when you point at the screen corner. If you point at the corner and use the scroll-wheel on your mouse, a menu listing all of the actions available will be shown and will allow you to select from them.
You will never miss when you try to click the corner of the screen, so CornerClick lets you do things without even looking.