Having the Internet at the tip of my fingers has been life changing. Being able to look up things such as addresses and timings has been really helpful. Also great has been Google Maps and the GPS, really helpful since my move out to California.
I finally have one device that functions as a PDA, MP3 player, and phone. All of the other stuff is just gravy. I know other devices have tried all of these, but I do not feel they executed on it as good as Apple. Now when I have to use someone else's phone it feels like a piece of garbage.
Agreed, nothing life changing like having kids, getting married, and stuff like that. However, it is kinda cool to have features like REAL wireless Internet access with a really adequate browser. Great portable movie player, to go along with the iPod. Just a great overall cool little gadget. ;D
Computer doesn't seem so important anymore. Email and internet on iPhone is simply mindblowing. The problem is, if I lose this phone, I will have to get another one cause there's no two ways about it. I am hooked to this phone.