I also seem to make a lot of mistakes. Actually, I blame it a lot on the new autocorrect changes that were brought with OS4. This was the first thing I noticed on the new iPhone. It seems to change words a lot more than before, and has lots of stupid changes as mentioned above. I also noticed that in the new phone it seems to want to change the length of words, as if it is trying to correct my spelling or something. I usually have no problems with spelling, only missing the proper letters on the touch screen. I think the new phone/OS is trying to do more of a spellcheck than it is autocorrect as in the old phones/OS. My iPhone 4 is constantly adding/subtracting letters to words, which is very annoying. I very rarely leave out a letter or add in an extra letter on the iOS keyboard, as it doesn't allow for a "mash" where it would accidentally hit two or more keys at once. I think this is a really big downfall, and I wish Apple would give an option to return to pre-OS4 keyboard functionality. It worked much better for me. I spend a lot of time typing, then deleting, and retyping because the autocorrect/spellcheck changes words with terrible logic. I had the 3G and 3GS and neither of those ever caused me problems while typing. I do, however, believe this is more of an OS issue than it is hardware and form factor.