AutoHotkey Reverse Scroll
Mac like natural scrolling for windows with AutoHotkey
A simple script for AutoHotkey that reverses the direction of the scroll input.
Download AutoHotkey here: http://www.autohotkey.com/
Here is an article from HowToGeek on the subject: http://www.howtogeek.com/57542/how-to-get-the-worst-os-x-lion-feature-in-windows-reverse-scrolling/