I promised to post my iPhone experiences at some point so here they come, even if in rather short form (realities of busy life these days). The key points are very positive ones: particularly the use of social media and Internet in general was radically transformed when I moved to iPhone. Everything is so much faster, more intuitive and pleasing to use. Listening of music, following video podcasts and Internet radio went up, too. The available applications (games, media, utilities) are fun and mostly moderately priced, but the App Store is also one of the obvious points of criticism. Apple has implemented a controlled environment for the use of iPhone, to a degree that the user sometimes starts to ask, who is really the owner of the phone, the actual owner, Apple, or even the operator that the user is locked with in the deal. It is of course perfectly possible to jailbreak iPhone, but the default situation for the regular user does not change. In this sense Symbian/S60 or Google Android based devices appear parts of much more open ecosystem. The lacking support of existing Internet standards is also obvious in the lack of support for Flash and Java in the iPhone browser. You can watch Youtube videos, since they have a specific iPhone format supported, but not regular Flash videos or animations that the net is full of. Also, and this is my final gripe with iPhone, the camera is below the standards I have gotten used to while being a Nokia N95 user. Images are blurry, too dark and more soft than you would expect from a 3 mega-pixel camera. This is a real pity, since the magnificent user experience and accessibility of all kinds of interesting functionalities would really make iPhone my dream device if camera and these other — relatively minor — issues would be dealt with. Now I continue to live in a two-phone (plus laptop, plus netbook, plus workstation…) configuration. Not everything can be expected from one environment, or manufacturer, I guess. Might be a good thing, even?
frans goes blog 
Do you find that the lack of multitasking bothers you? I use Fring on my phone (S60) quite a bit and it would be useless without being able to run it in the background.
I am not a big fan of java nor flash myself so I’m kind of indifferent in the lack of support in iPhone. It might even force some websites to implement their services using real standards (HTML5) instead of proprietary pieces like flash or java.
You are right about Java and Flash as closed add-ons, and need to go towards open standards in rich online media in general. It is just that in everyday use we are not there quite yet. About multitasking: it is an obvious lack in iPhone OS, but mostly it does not bother me so much. I have found out that most of the services that I need to run in the background can be run in a Safari window, and Apple has allowed Safari to continue running while you go to another app. (Pretty self-righteous from Apple, of course.) But if you rely on a third-party communications app like Fring, then that is an issue, of course.