hehe, let's not turn this into a iphone vs. nokia flamewar.. I've used the iphone for over 2 years (since the very beginning of the iphone). I had received it as a gift, and I had no choice but to use that because I didn't have anything better (and once you're used to a 400$ phone, the 10$ phones I could afford weren't really an option).
So I know exactly what the iphone is like and how it works, but I couldn't stand it anymore.. it doesn't do the "regular" things correctly, everything in it is crippled.. I never used safari because it was too slow and hard to use, I never used the camera because it was crappy and too simplistic.. I never used the ipod because I personally don't listen to music.. so really, the only thing I used it for is : phone, sms, and the occasional notes.
it did the job, but was really slow and not that great. When I tried to install new apps and do something else with it, I realized that everything was just crappy, and the fact that you can't run more than one app at once really made the device worthless.
I don't really agree about the user interface being the best, most user friendly.. I think they just make people think that.. with their whole marketing stuff and the world's attitude, whenever apple does something, it is tagged as "the best UI ever", without even actually trying it.
Yes, it's simple, yes, it doesn't take a long time for grandma/grandpa to know how to use it, but that doesn't make it "the best user interface", it just makes it "the best user interface for morons", and in my case, I'm no grandma/grandpa, so in my opinion, their UI sucks.
Have a look at the n900's user interface (screenshots/videos), I think it's beautiful and gorgeous and very powerful and user friendly! It does have little problems of usability though, but nothing major, I already got used to it.
p.s: I had my iPhone since october 2007 and the battery life was still holding up for about a 5 days... I never turned off the iphone during my 2 years of use... I stopped using it when I got my N900 in november, and I kept it on for a few weeks after that in case I needed to review old sms/contacts that I didn't transfer to the N900, and without using it for making calls, the charge was able to hold up for 1.5 to 2 weeks... and yes, wifi is usually on, no bluetooth, and since it's the older model, no 3G either.
So that's good! The N900 battery holds up for about 24hours, so it sucks.. but I charge it every night when going to bed, and so far, it never died on me (and I usually have about 10 to 15 applications running all the time, with xchat (IRC) running and connected on skype, sip, gtalk and msn accounts with the integrated IM framework)