The iPhone can't run multiple apps simultaneously, thus the big blank space at left. When you switch apps, you essentially close the current one down to open the new one. The Palm Pre (at right) uses the intuitive card metaphor to move among apps (you close an app by pulling its card up and out of the array). Not only can apps run at the same time on the Pre, but they can work with each other, such as to exchange information. The Pre's approach to running multiple apps is easily its most significant advantage over the iPhone.

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