The iPhone. OK you are tired of the news. So I won't bore you with my first experiences. I'll just observe that it truly is wonderful. Apple has a huge hit. They really have redefined the cell phone experience. Other phone manufacturers should really think this through and not discount the impact that Apple will have in this segment.
My two complaints so far -- AT&T is stupid. But then again, they all are. It was fascinating watching how much Apple has done to make the integration of the AT&T part of the experience work in a smooth Apple way. But Apple can't cover for everything. So when I happened to type in my street address with the full word "Avenue," AT&T's computers responded that the didn't recognize the address but did have a similar one... it was my address but with the abbreviation AVE. This strikes me as the kind of user experience that Steve Jobs would never allow in an Apple product. It just screams "we are stupid!"
Second complaint is that I can't download software. I can't switch from the horrible Safari to the much better Firefox (or Opera or). I can't add in Adobe Flash (why did Apple leave it off the device!? it is part of the web stack!). I can't load my favorite apps...
But there are so many surprises lurking inside this device. There are fundamental changes in the way you think about your phone when it synchronizes seamlessly with your contacts, email, photos, videos, music, calendar... By the way I think it works incredibly well with the Mac but I have no idea how well it works with Windows.