Good Gear Guide
In pictures: New features in iPhone Software Updat...
Some of the iPhone settings menus have been tweaked to suit the new features. Apart from Spotlight result restrictions and the addition of Parental Controls, the most notable new options are the ability to enable or disable MMS and a new iPod feature called "Shake to Shuffle." This is enabled by default, and shuffles the music when you shake the phone; not necessarily earth-shattering though certainly iPhone-shaking.
In pictures: New features in iPhone Software Update 3.0