There are limitations to the iphone that can prove grating after a year of use (its my primary phone). No bluetooth keyboard support and definitely not built in anyhow. Low screen res that makes it hard to view things like PDFs or remote desktop. Lack of a direct linux port (alhough certain teams are working on it).

What the iphone does well, sorry fantastically, is ready and out of the box. The web browser is great, it opens up PDFs without much of a fuss and has a famous media player. Basically a great UI experience for what the average consumer will need most of the time. All of these things bar multitouch can be replicated in other devices if you configure them.

While the iphone is getting better with apps, I feel alot of them (for me anyway) are just internet shortcuts, games, subpar prouctivity apps or gimmicks. There little that can not be replicated or bettered and in no way a UMPC experience like my OQO/Everun or HTC Advantage or what I expect the N900 could provide.

Additionally a 5mpx Carl Ziess would make it an ideal blogging tool as well. I could have survived with the dimensions of the N810, at least 4 mobile cell devices are going to be released with >4 inch screens in the next 5 months so it is definitely becoming more acceptable.