Neven-
Thanks very much for the kind words. Great to hear that you like FitSync and have started using it regularly again. We just made some changes to our workout widgets and profile widgets so take a look at them and tell us what you think. We're also in the process of making some upgrades to our mobile features so I'll pass on your request for editing exercise notes to the dev team for consideration.
On to your question - we have not tested the iPhone but we have several users who have reported that our JAVA/J2ME app runs fine on the iPhone. You should be able to go to
http://fitsync.com/install on your iPhone's browser and download/install our app over the air just like you did for your SE (I have FitSync on a SE K700i). The only possible limitation might be if your network operator blocks downloads but in the US Verizon is the only operator that I know of that still does that and I don't believe they will be offering the iPhone.
Thanks again for checking in and the nice compliments. Stay in touch. Best of health to you!