I keep hearing about the importance of tactile feedback, but I don't really get it. At first it's disconcerting to type on a flat piece of glass, but after awhile it's not. I can see the argument for "raised keys" or "bigger keys" or "more space between keys," but I don't see why my finger needs some sort of click/buzz/snap/vibration/whatever just to tell it it's doing something - once it gets used to the lack of such sensation. Isn't the finger/brain combo smart enough to figure this out with a little conditioning? In my experience, yes.
My biggest goofs with the iPhone keyboard are when my fingers aren't properly oriented over the correct keys (which sometimes happens even on my computer keyboard, so tactile feedback doesn't necessarily cure that problem) or when the autocorrect gets a little over-insistent.