There are plenty of other more subtle tweaks that are making the pilgrimage from iOS to Mac OS, all in the name of streamlining the interface and the many ways we interact with apps. From more legible and universal icons (see Mail 5 on Apple's Lion page), to popovers (see iLife '11), to scrollbars that can hide when you don't need them, Mac OS X Lion will simply look cleaner and more intuitive than any of its predecessors, and it has iOS to thank.
Viva la Mac
But if the iPad was "just a giant iPod touch," is the Mac becoming "just a giant iPad?" Not in the least. The file system hasn't gone anywhere, the Finder looks to have received some much-needed attention, and despite concerns of Apple embracing digital totalitarianism after announcing the Mac App Store, you will not be forced to give up the ability to install software from anywhere on the Web.
Another new Lion feature Apple announced, "Resume," is also an ode to iOS, but it will likely have an even larger impact on the Mac. Just like switching between apps on an iPad or iPhone, or even restarting the device, Resume is Lion's official support for third-party Mac apps to pick up right where they left off, even after a restart. That's not merely a good idea in iOS, it's just a good idea for any reasonably complex computing device--especially one that is designed to multitask and juggle many apps and open windows with ease.
Speaking of recovering your data, a pair of new features will make it easier to continue working with individual documents and recuperating lost data--key requirements of any worker bee who needs more power and flexibility than iOS typically offers. Auto Save will allow apps to automatically save your work as you create it, while Versions brings the continuous backup concepts and interface behind Time Machine down to a per-document basis. You will be able to step back through the history of the current file on-the-fly and easily revert to a previous iteration.
Great artists reciprocate
iOS and Mac OS X are symbiotic entities. When designing iOS, Apple distilled the Mac down to something pocketable, but the core concepts are there, such as an app-centric workflow, an always-accessible "home base" Dock, and a fierce pursuit of intuitive interfaces. After gaining knowledge and experience from nearly five years and four versions of iOS, Apple clearly felt that it's time to return the favor in Lion. Apple is incorporating some of the fresh simplicity of iOS back into its point-and-click desktop computing platform that, at its conceptual core, is almost three decades old.
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