1. Speed. This phone is blazing fast. Can you say instant? I mean, this thing is fast.
2. Camera. This is why my wife upgraded. Really, it rocks. The only camera I have that is better is my Canon digital rebel SLR.
3. Siri. If you haven't already heard, this is the near instant digital assistant you talk to. You don't just give her commands, you have conversations with her. It completely changes how you interact with your computer (the iPhone is a Mac computer if you didn't already know). This is science fiction cum science fact. The speech recognition is nearly flawless, and it not only recognizes commands, but responds to conversations and intelligently interprets intended meanings.
My prediction: within 2 years, Siri will reach the status of cultural icon. It will become so indispensable that iPhone market share will only increase as people grow into understanding how to use it.
So, Apple does it again: the hype for a product seems too good to be true, but the reality makes the hype an understatement. Damn them, now I have to buy some more Apple products! On the agenda for 2012: two MacBook Airs, Apple TV, and hopefully another (used) iMac or two. Anyone have a part time job I can take up?