The analysis of the Donald Rumsfield quote: "There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we now know we don’t know. But there are also unknown unknowns. These are things we do not know we don’t know."
Includes instructions & download links for the iOS update.
Direct download links for the iOS 4 firmware. Quite handy for failed download attempts through iTunes