Normally, the little corrections made by the iPhone are more frustrating than anything else
I somehow disagree with this statement. Through my extensive iPhone usage during the last couple of months I discovered that the corrections function learns more and more depending on how often you use and correct the words it thinks you have misspelled. It somehow correlates to the early days of spam filters which had also a higher amount of false positives compared to the modern improved implementations. The first days of typing are the pure horror, but it gets better and better. However, I discovered that the function works better for native English than other languages like Polish or German.
[via TUAW]