Along with the official changes of yesterday’s update, there are some unofficial changes that aren’t good enough to make a bullet point on Apple’s list. Which is weird, because some of these are huge.

• You can now select different alerts for incoming messages:
  Settings -> Sounds -> New Text Message -> choice of:
  Tri-Tone (default), Chime, Glass, Horn, Bell, Electronic
• International keys are available by holding down the letter key.
• The iPhone mail application supports MP3 and .wav Attachments
• includes the closed captioning abilities promised
• enables a debug console for MobileSafari for web developers to find errors on their pages:
  Settings -> Safari -> Developer -> Debug Console [on/off]
• breaks every 3rd party jailbreak — the iPhoneDevWiki team will have to reverse-engineer the iPhone all over again
• since the iPhone can’t be jailbroken, there is no way to get 3rd party ringtones on the iPhone.

And just for the sake of posterity, after the break there’s a readable version of Apple’s list of official changes.

• iTunes Wi-Fi Music Store
Louder speakerphone and receiver volume
• Home button double-click shortcut to phone favorites or music controls
• Space bar double-tap shortcut to intelligently insert period and space
• Mail attachments are viewable in portrait and landscape
• Stocks and cities in Stocks and Weather can be re-ordered
• Apple Bluetooth Headset battery status in the Status Bar
• Support for TV Out
• Preference to turn off EDGE/GPRS when roaming internationally
• New Passcode lock time intervals
• Adjustable alert volume