I had to retire iPhone 3GS and return it back to my love @bazinia. I think she'll take good care of it. In my turn I am enjoying Blackberry again. (And I know @rwaldin knew this would happen :-) Frankly speaking, I just decided it's not worth it for me to keep it. I will wait until Apple will bring new iPhone which would be less of a game device but at least a little bit more of productivity booster. This time my tipping point was not keyboard (can really get used to touch-typing) or battery life (I have a bunch of wall/car chargers for this), but terribly slow email client and very inefficient access and operation with it and the calendar.
So I either have to wait for Apple to fix it or do it myself the way I want :-) none of those options really seems to be happening in the nearest future so I'd stick to Blackberry for now.