Apple has seeded their latest iPhone software to developers, iPhone 2.2 beta 1, and it comes with a number of changes over the current version of Apples iPhone OS.
As well a receiving 2.2 beta, they have also had the latest version of the iPhone SDK (9M2611).
iPhone 2.2 beta 1 contains mainly bug fixes, with no noticeable new features or functions, except for a slight tweak to Mobile Safari, where the google search bar has been moved next to the URl field instead of underneath.
Macrumors via Apple iPhone Apps