The default scroll direction in OS X Lion has been inverted to be the same as what you would be using on an iOS device. Although it makes perfects sense on an iOS device, this new scroll direction is very confusing when you’re so used to the normal scroll direction in a non-touch device
You can easily reverse this scroll direction back to what it was in Snow Leopard through the Trackpad Preferences under your System Preferences. In Trackpad Preferences, click on the “Scroll & Zoom” tab, and deselect the first option, which is called “Scroll direction”:
And ta-na! Sanity has been restored…
