Most of these additions came as no surprise--in fact, many were what we wanted when . And the majority of these new additions aren't exactly revolutionary, like multitasking, for example; most of the features announced today already exist in various forms in other mobile operating systems. This raises the question: Is Apple pushing its mobile OS into the lead once again, or is it merely catching up with the level of innovation now being offered by challengers like Android and Windows Phone 7?

And will Apple's implementation of these features into the phone be better than that of its competitors? The answer to that last question might be Yes: I was impressed with how intuitive and tightly integrated the new features are in the OS. Of course, we won't know who does what better until we actually take iPhone 4.0 for a spin (same for , for that matter).

For the sake of brevity, I will focus on how the iPhone 4.0 operating system compares to the and what we know about the Windows Phone 7.

At last, the (well, not the iPhone 3G and 2G, unfortunately). iPhone 4.0's multitasking system is incredibly simple and clean, and according to Apple, won't be a drain on your iPhone's battery life.