Smart Scroll 3.6 - Enhances window scrolling, scroll from keyboard and much more. (Shareware)

• Super Scroll offers smooth and easy iPhone-like scrolling. It improves even Magic Mouse, and you can reverse scrolling on the Mac to match your iPhone. Try it!
• Hover Scroll makes scrolling as easy as pointing to the top or bottom edge of a window.
• Grab Scroll gives you a Hand tool to easily move (with momentum) any window's contents.

Other features include Universal Scroll Keys, trackpad and scroll wheel accelerator, and more.

• New: Touch trackpad with 2 fingers (1 for Magic Mouse) to stop coasting (Thanks, Erling Ellingsen!)
• New: Separate settings available for Multi-Touch (trackpad/Magic Mouse) and Scroll Wheel.
• Fixed Smart Scroll not always working in Finder.
• Firefox problems: turn off Smooth Scrolling in Firefox under Preferences:Advanced:General (Thanks, Ari Takahashi!)
• Fixed cursor still showing Hand after stopping Grab Scroll with Hold Primary button (Thanks, Nicholas Quixote!)
• Various other fixes and improvements.