Out of nowhere Apple has quietly released a new firmware update for iPhone and iPhone 3G. This latest release, 2.2.1, weighing in at 246.4 MB, is said to have have improved general stability of Safari and has addressed the issue where some images saved from Mail did not display correctly in the camera roll. It is unknown at this time if Apple has snuck in any other tweaks or features, to follow along and report any findings be sure to head into our forums to the newly started thread - iPhone software 2.2.1 released?
To update simply connect your iPhone/iPhone 3G to your computer and "check for update" via iTunes.
Note to Jailbreakers/Unlockers: Do not update your iPhone/iPhone 3G until the all clear is given by the iPhone Dev Team.
[Thanks to forum member sting7k for the tip!]