KatMouse is a real timesaver, especially with an extended desktop or dual screens.

When you are working with several different windows open you must have noticed how annoying it is to have to click on a window before you can scroll the contents of that window using your mouse scrolling button. KatMouse is a simple free utility that overcomes this by allowing scrolling in any window simply by hovering the cursor over the Window. This is a major increase in the usefulness of the mouse wheel.

An optional side-benefit of the KatMouse software is that you can use the wheel button for a kind of task switching: with a click of the wheel button you can push the current window under the other windows on your desktop.