Windows includes a Volume Control to maintain speaker volume. However, it is not as convenient as it could be. You have to open up the Volume Control menu. It takes time and a chunk of your screen.
Those are two drawbacks you don't need when you encounter blaring Web page music or video.
Volumouse turns your mouse's click wheel into a volume dial. Already at your fingertips, it's both convenient and intuitive. And you don't have to open a menu to use it.
By default, you can activate Volumouse by pressing and holding the Alt key. Otherwise, you can use your mouse's click wheel to scroll through Web pages and other documents as normal.
You can also customize Volumouse to activate through other keys. For example, turn the click wheel into a volume dial whenever you hold the right mouse button down. If you don't use the click wheel for anything else, you can even set Volumouse to always-on.
Volumouse can also control Windows Media Player volume whenever the player is on screen.
Cost: free
Link: http://www.nirsoft.net/