Have you ever tried scrolling content on a window that isn’t currently focussed (inactive)? It isn’t possible on Windows. WizMouse is a nifty little freeware that allows you to actively scroll content on an inactive window, instead of having to click the mouse on the inactive window to start scrolling. Though what it offers is very negligible, you might desperately need it under certain circumstances where you need to read the content on both the windows you are working on.
Download WizMouse [via CNET Download.com]