Another take on Lion
In Mac OS X 10.7, known as Lion, Apple went with the “shake things up” philosophy. It follows an old Apple pattern of embracing what’s cool and progressive, and ruthlessly jettisoning what it considers antiquated. That’s great if you love stuff that’s cool and progressive, and not so great if you hate people moving your cheese.
The final good news, though, is that you can ignore all of this. If you prefer the status quo, you don’t ever have to put an app into full-screen mode, or use a touch gesture, or open apps from the Launchpad. You can even turn off that reversed-scrolling-direction thing. Just this once, Apple isn’t dictating the way you have to do things.