Screen size is still the same!
Not sure why you guys are thinking the screen is smaller? Still the same 3.5"
I have to say, there is a learning curve, but I love typing on the iPhone. I can fly while typing actually. I could definitely understand if someone doesn't enjoy it though.
One good thing too, although the screen is 3.5", smaller than a lot of new HTC's at 3.7 or new Sony Ericsson at 4.0, the aspect ratio keeps the iPhone screen just as wide or wider, making typing very good in portrait mode.