Currently, there's Mac OS X for, well, Macs, as well as its "little brother," iOS, for Apple's mobile devices. However, Mac OS X Lion, which will prowl next summer, will introduce iOS features into Mac OS X proper. That's a trend that I'm sure will continue.
In fact, I think it won't be long before there's no Mac OS X or iOS as separate entities. There will simply be one operating system known as Apple OS. The features of the two now-separate, but kin, operating systems will merge into one, scalable system.
Writing for "InfoWorld" (http://www.infoworld.com/d/mobilize/say-good-bye-the-mac-os-hello-mios-4...), Galen Gruman predicts a merged Mac OS and iOS that "will be able to scale across Mac Pro workstations, MacBook laptops, iMac and Mac Mini desktops, iPads, and iPhones --...| Read more »