3.0 looks ok,
Would like copy n paste (be first phone that i know of with this feature,, ,,,, well except Palm)
disable screen rotation.. that'd be nice, sometimes i don't want it to flip, seriously the accelerometer is sensitive (but accurate)
As far as changing carriers, I honestly don't think Verizon is going to give up its VCAST to allow the likes of Itunes stepping in on their territory. By far, apple sets the standard that other phones are trying to copy.
I don't think the Iphone is going to get any new hardware updates till the end of the year or beginning next. Only hardware change would be either minor upgrades or a nano-version or forward vid conferance camera