One of the rumored features of OSX Lion is iOS-like scrolling. It may not be immediately obvious, but that actually means scrolling will be reversed! On a touchscreen, dragging up moves the page down, whereas the opposite is true on desktops.
You can try this out right now if you have OSX 10.5 or above, with the tiny Scroll Reverser app. It’s easy to install and uninstall, and so far seems to work perfectly. Of course, you will be able to turn it off in Lion, and if my experience is anything to go by, you will probably do just that. There’s something very strange about reverse scrolling with a mouse or trackpad. Even jumping from iOS right onto OSX with reverse scrolling is jarring. However, Apple are masters of designing interfaces, so there must be a good reason for introducing this… I just can’t see it yet!
Try out Scroll Reverser and see if you’re ready for touchscreen-like controls on your desktop!