One of the features that you’ll notice in Lion almost as soon as you first log in, is the way the mouse and trackpad approach scrolling.
There’s no other way to say it – It’s up side down!
Here is a quick tip that can get you scrolling the right/old way.
Go into System Preferences for either your mouse or trackpad and you’ll see there’s an option there for scrolling. In the screen shot above, its the very top option. Turn off natural scrolling and you’re back to the way you used to be.
Me, well I’m going to leave the Lion natural scrolling turned on for a few days to see if I can break the old habit!