KetMouse can power-up the scroll wheel on your mouse. After installing this program you can use your mouse scroll wheel to scroll windows that don't have the screen focus. It doesn't sound like a big deal, but if you've ever used a Mac (where this is built-in), you'll realize what a nice time saver this is. This app also allow you to use the clicking of the scroll wheel to move windows down in the stack of windows so that you can change focus without have to find the next window. This is really convenient when one window is blocked by another.