Multi-Touch is the future. Today, Apple took yet another step in that direction, introducing the Magic Mouse, now shipping with the new iMac and available on its own ($69). Also included in Apple's announcement today were enhancements to the iMac (now available in 21.5-inch and 27-inch widescreen 16:9 aspect ratio displays and the optional quad-core Intel Core i5 or Core i7 processors). Mac mini and MacBook were also updated.