Mac OS X Lion by default is mimicking the scrolling experience of iOS touch devices, such as iPhone and iPad.
For desktop users I find it quite hard adjusting to the inverse scrolling, especially when using mice devices.
Don’t panic, it’s just a simple option on the System Preferences, so:
System Preferences -> Trackpad -> Scroll & Zoom -> Remove check from “Scroll direction: natural”
Just a note. This isn’t the case for people with the older trackpads. I’ve taken a screenshot.
http://members.westnet.com.au/rabelford/trackpads.png Fuckshit. Sorry. this is the correct link