I ran across this little gem at Lifehacker http://www.lifehacker.com/
It allows your mouse to scroll in *any* window or pane your mouse is in.
Not being able to do that has been an annoyance of mine for a long time.
I'm happy to report it works great, and the tray icon is cute (not a requirement but fun anyway).http://www.code-scout.net/katmouse/
from the site:
"The prime purpose of the KatMouse utility is to enhance the functionality of mice with a scroll wheel, offering 'universal' scrolling: moving the mouse wheel will scroll the window directly beneath the mouse cursor (not the one with the keyboard focus, which is default on Windows OSes). This is a major increase in the usefullness of the mouse wheel.
Another feature involves the wheel button. Since the wheel button is not consistently used in Windows, KatMouse can use it for a kind of task switching: with a click of the wheel button you can push a window to the buttom of the stack of windows that is your desktop, making a recovered window the active window."