My boss has one and he won't shut his friggin mouth about the thing. Someone will say "Hey you got an iPhone" and he will proceed to tap on the display and hand it to the person, as if forcing his apple fanboyism on them. I would like them more if it weren't for him pushing all his crap on me. I really think he tracks me with my company provided gps phone. Some people have said if I call in to work and go out too another site of ours, he will bring up his iPhone and go to a website where they can track their phones locations. He says he's not a micromanger though.
I would love to have one but the extra cost is not so appealing right now. It would be around $100 a month for me to have one. Maybe after the at&t plans come down in price. They do a great job surfing the net, email and voice mail is what every single halfway intelligent cell phone should have. You have visual voicemail and can choose what messages to listen to and not listen to the ones you don't...awesome.