KatMouse is a useful little application for Windows that makes your mouse's scroll wheel even more useful. It changes the behavior of the scroll wheel to let you scroll any window on the screen, not just the active one. So if you're, for example, entering text in one window while reading from another, you can scroll down in the latter without changing the focus away from where you're entering text. KatMouse also has useful feature for task-switching that lets you use wheel-clicks (I've met a surprising number of people who don't realize the mouse wheel is also a button) to "push down" the current window, i.e. clicking on the current window with the mouse wheel will make whatever window is below it pop to the top. However, this function takes over the wheel-click functionality entirely, which will annoy you if you're used to using it for other things, like opening and closing tabs in Firefox. Fortunately, this function can be turned off. You can also specify a list of applications that won't be affected at all by KatMouse. KatMouse is among those great applications that are completely invisible (well, except for an icon in the system tray) but make your life easier, and it's free, too. Update: Fellow Download Squadder Jason Clarke informs me that we've covered KatMouse before. OMG dupe! Oops.

[Thanks, Roxy!]