Firmware 3.1 changes

Below is a list of changes that have been found thus far.

• Trimming video clips on the iPhone 3GS now offers the ability to save the edited version as a copy rather than simply overwriting the original file.
• Voice Control over Bluetooth is now available, allowing users to Initiate calls and control music playback via Bluetooth headsets.
• MMS is now enabled by default, but still not supported by AT&T.
• iPhone vibrates when rearranging Home screen icons.
• A “Fraud Protection” toggle is now available in Safari settings.
• iPhone startup and shutdown and app launching times have improved.
• New APIs allow developers of third-party application to access and edit videos.
• OpenGL and Quartz have seen improvements. -via macrumors