This article pretty much tells how the iPhone has changed my life:
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Excerpt:
To illustrate, a typical day goes something like this: When the iPhone alarm wakes me up each morning, a swipe of the screen silences the alarm and brings up the Weather widget. With one gesture, I have enough information to plan my wardrobe and departure time, all before I’m even sitting up. Because the iPhone remembers the last-used application before it locks itself, any app can be used in this way.
Next, I click on the Home button to get to E-mail and the Calendar so I can prepare for the day mentally. Once I’m out of the house, the iPhone is linked into my car stereo, so it’s always on as an iPod. And because my iPhone is also how I keep in touch, I never miss an e-mail, a text message or a phone call because of loud music—the music mutes automatically when a call comes in. Since I commute daily from Orlando to Tampa, Google Maps lets me know what kind of traffic I’m facing, which helps me plan my routes.
Once at work, most of my day is spent staring numbly at progress bars, waiting for software to install. For those idle moments, dynamic content by way of the iPhone’s mobile Safari browser and YouTube access is a godsend. The iPhone’s media capabilities and its always-on cloud connectivity break the monotony, and since it’s also my communications device, it keeps me always accessible. That’s a downside, too: I’m always accessible.
Focusing on my iPhone use startled me into realizing that if my iPhone broke, or if Apple suddenly stopped making it and I had to use another brand, I’d be lost. I wouldn’t know which device suited me, despite all of the competition in phones out there, because, in one way or the other, they’re all wrong for me.
http://www.macworld.com/article/133195/2008/04/iphoneuse.html