Windows Mobility Center in Windows 7 or Vista
I recently, very accidentally discovered Windows Mobility Center. I had seen it before but never really thought about it. If you hit Win+X, you will see a window pop up. Here you can control many things like Display Brightness, Sounded, battery, presentation mode and many things. It's a very simple easy handy shortcut. Unfortunately, it is for Windows 7 and Vista for laptops.