I just found out about an amazing feature in KDE's Konqueror, by mistake!
What happens if you're reading a Web page and you hit the Down Arrow key while the SHIFT key is depressed?
Try it. You'll see the Web page scrolling down slowly, at a pace you can read from, without having to scroll manually. You can regulate the speed at which the page scrolls by using the Down or Up Arrow keys while holding SHIFT depressed.
To stop the autoscrolling, hit the Esc key.
Fantastic! Sheer genius!