Mac Whacking: switching between desktop environments is a slap!: "From this post by Tom Krazit at CNET we learn of Erling Ellingsen who has developed a way to use the motion sensor in modern Mac laptops to allow him to tap the side of the screen and bring up different desktop environments. He has posted a video of this amazing feat as well as all the geeky details on on how to get this stunt to work.